Download or read book Comparison in Rolling Contact Fatigue Life Between Recent Clean Through Hardening Steels and Carburizing Steels written by N. Tsushima and published by . This book was released on 1993 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rolling contact fatigue lives of through-hardening steels and carburizing steels are getting close if compared with regard to 10% life. However, carburizing steels are more reliable than through-hardening steels because they have longer life with regard to 1% life. In this way, carburizing steels show superiority to through-hardening steels under lubrication conditions less contaminated. However, they lose their superiority when used under contaminated lubrication or high loading conditions. To increase rolling contact fatigue life of carburizing steels, it is effective to increase case depth. By increasing case depth, the life of a carburized bearing increased significantly under clean oil lubrication as well as under contaminated lubrication and high loading conditions.
Download or read book Creative Use of Bearing Steels written by J. J. C. Hoo and published by ASTM International. This book was released on 1993 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solicited papers from a November 1991 ASTM symposium on [title] held in San Diego, CA are grouped into seven sections: heat treatment carburizing and through-hardening; surface modification; powder metallurgy; corrosion resistant bearing steels; new bearing steels; improvement of rolling contact fat
Download or read book Bearing Steels written by J. J. C. Hoo and published by ASTM International. This book was released on 1998 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of a November 1996 conference in New Orleans, update previous information and present new materials and processing relating to steel for the anti-friction bearing industry. Among other subjects, they cover steel cleanliness and measuring methods, bearing fatigue life, advanced steel
Download or read book Rolling Contact Fatigue Life of Various Kinds of High Hardness Steels and Influence of Material Factors on Rolling Contact Fatigue Life written by K. Maeda and published by . This book was released on 1988 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of material factors, such as types of steels, steelmaking process, cleanliness, fiber orientation, forging ratio, subzero treatment upon rolling contact fatigue life, was investigated for rolling bearing steels produced recently. Rolling contact fatigue life of recent steels which have high cleanliness has increased remarkably, and the influence of fiber orientation or subzero treatment upon rolling contact fatigue life is negligible, contrary to previous steels. Rolling contact fatigue life levels of each type of steels tested under three different test conditions were described. Depending on test conditions, their rolling contact fatigue strengths relative to others differed significantly in some cases.
Download or read book Metals Abstracts written by and published by . This book was released on 1995 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rolling Contact Fatigue Testing of Bearings Steels written by J. J. C. Hoo and published by ASTM International. This book was released on 1982 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alloys Index written by and published by . This book was released on 1993 with total page 950 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carburizing written by Geoffrey Parrish and published by ASM International(OH). This book was released on 1999 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed discussions and over 250 graphs and charts describe the effects of microstructure on the properties of carburized stees. In-depth coverage clarifies the causes, interpretation, prevention, and consequences of various microstructural variations and defects in carburized parts. Also covered are the effects of post-hardening heat treatments, surface grinding, and shot peening. Contents: Internal Oxidation Decarburization Carbides Retained Austinite Grain size, Microsegregation, and Microcracking Core Properties and Case Depth Post Hardening Heat Treatments Post Carburizing Mechanical Treatments.
Download or read book Influence of Various Material Factors of One Percent Chromium Carburizing Steel Upon Rolling Contact Fatigue Life written by N. Tsushima and published by . This book was released on 1982 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Improvement of the Rolling Contact Fatigue Resistance in Bearing Steels by Adjusting the Composition of Oxide Inclusions written by Tomoko Sugimura and published by . This book was released on 2014 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Improvements in the rolling contact fatigue resistance of bearing steels need to be made, and various researches to achieve this have been implemented. It is particularly important that, among the non-metallic inclusions, the quantity of large-size oxide inclusions be reduced. Therefore, studies looking at minimizing oxide inclusions have been carried out. More recently, however, a new approach to improving the rolling contact fatigue resistance, different from previous methods, has been undertaken. It has been reported that the condition of the contact at the interfaces between the matrix and non-metallic inclusions is important because it affects the stress state around the inclusions, and that this condition needs to be considered to improve the fatigue resistance of bearing steel. In this paper, to develop bearing steel with a rolling fatigue life better than is currently the case, the relationship between the rolling contact fatigue resistance and the composition of oxide inclusions is investigated. By controlling the composition of the oxide inclusions, fatigue failure was avoided in a thrust-type rolling contact fatigue test, and the fatigue life (L10) achieved was greater than 200 million revolutions. The reason for this improvement is considered to be the absence of voids at the interface between the matrix and the non-metallic inclusions, which would otherwise have a negative effect on the fatigue life.
Download or read book Effect of Work Hardening on Rolling Contact Fatigue Strength of High manganese Austenitic Steel written by T. Fukui and published by . This book was released on 1989 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bearing Steels written by J. J. C. Hoo and published by ASTM International. This book was released on 1975 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Numerical Approaches for Improving Rolling Contact Fatigue of Bearing Steel Through Enhanced Compressive Residual Stress written by Xiaomin Cheng and published by . This book was released on 2007 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Hardened steels are attractive materials due to their desirable properties such as wear resistance and fatigue strength. They are widely used in transportation, energy generation and general mechanical engineering applications. The components in these applications are often loaded near their physical limits. Therefore, they have to be thermally treated to the desired mechanical properties and then finished in the hardened state in order to achieve surface integrity, dimensional accuracy, and shape. Hardened steel have traditionally been machined to finished geometries by abrasive processes such as grinding. Hard turning as a replacement for grinding becomes more and more attractive due to lower production cost, shorter cycle time, fewer process steps, and higher flexibility in machining the complex workpiece geometry. However, there are still several fundamental issues to be solved in order to replace grinding with hard turning. Rapid tool wear remains an impediment to the process being economically viable due to the high cost of CBN cutting tools and large down time due to frequent tool change. Another issue is related with surface integrity. A hard and brittle white layer, which is detrimental to part performance, will be generated at the machined surface under certain conditions. This white layer has to be avoided. In this research, a hybrid process was developed and carefully designed. It takes the advantages of both shot peening and hard turning processes that result in the extension of fatigue life, elimination of white layer and minimization of tool wear with acceptable surface finish. A hard turning model was developed to evaluate the influence of machining parameters and tool edge geometry on the temperature distribution, cutting force and residual stress profile. The model was validated by comparing the chip morphology and cutting forces with the experimental results. The predicted residual stress was also compared with the measured data. It was found that although honed edged gave the deeper and larger compressive residual stress, the cutting temperature and cutting forces increase dramatically which leads to quick tool wear. Shot peening process was also investigated for its efficacy in imparting compressive sub-surface residual stress in hardened surfaces. Single and multiple shot models were developed to study the effect of shot peening process parameters, workpiece material, surface conditions and the interaction between individual shots on the distribution of the compressive residual stress field. The models were both validated by experiments from literature and those conducted by this author. It is shown that the presented results are in good agreement with the experiment data. Predictive models of the shot peening process were developed using Response Surface Methodology (RSM). FEM simulations using the multiple-shot model were conducted in order to develop response surfaces of the residual stress field. Stochastic simulations were carried out using these response surfaces. Statistics of the output variations were calculated using the stochastic Monte Carlo simulations. The results gave the quantitative numbers about the variations of the residual stress field. Interaction between the residual stress fields induced by shot peening and hard turning was investigated using numerical simulations and then validated by experiment. It was found that shot peening as a pre-process can enhance the residual stress and fatigue life of a hard turned component. However, improper hard machining of shot peened surface can lead to removal of shot-peened residual stress.
Download or read book An Investigation of Rolling sliding Contact Fatigue Damage of Carburized Gear Steels written by Patrick C. Kramer and published by . This book was released on 2013 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Study of the Evaluation of the Fracture Initiation and Propagation on the Rolling Contact Fatigue in Bearing Steels written by Akihiro Owaki and published by . This book was released on 2017 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The bearings used in various industrial machines need to have good rolling contact fatigue resistance. It is known that the fatigue resistance in clean lubricating oil is decreased when there is a nonmetallic inclusion in the bearing steel. For this reason, various studies to reduce the size and quantity of inclusions have been carried out. On the other hand, to obtain a new approach to suppress the influence of the nonmetallic inclusions, it is important to understand the influence of each nonmetallic inclusion type on the rolling contact fatigue resistance. Therefore, we have worked on evaluations of the fracture initiation and propagation on the rolling contact fatigue in bearing steels. In the previous symposium, we reported that we had created an oxide type inclusion controlled steel (OTICS) using the melting furnace in our laboratory. This steel has an excellent rolling contact fatigue life. In this paper, we will report fracture initiation and propagation on the rolling contact fatigue in OTICS and conventional steel evaluated using an ultrasonic test and an acoustic emission test. We have investigated the defects under the rolling contact surface by the ultrasonic test, with loadings applied at certain times in the thrust-type rolling contact fatigue test. During the test, we also measured the acoustic emissions generated when a fracture occurred. From the ultrasonic test, we succeeded in detecting nonmetallic inclusions with the fractures. Furthermore, the time before defects were detected in the OTICS was longer compared to conventional steel. The same tendency was observed in the acoustic emission test. Longer load times were required before acoustic emissions were detected in OTICS. According to these results, it can be considered that OTICS has a greater rolling contact fatigue life than conventional steel due to the inhibition of the fracture initiation from the nonmetallic inclusion.
Download or read book Rolling Contact Fatigue Testing of 9260 Steel Processed by Quenching and Partitioning written by Adam Shutts and published by . This book was released on 2006 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Hardness Surface Finish and Grain Size on Rolling Contact Fatigue Life of M50 Bearing Steel written by R. A. Baughman and published by . This book was released on 1958 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of hardness, surface finish and grain size upon the compressive rolling contact fatigue strength of M-50 bearing steel has been studied. Considerable testing on the RC Rig and statistical treatment methods have been included. A mathematical expression relating these variables to life expectancy is presented and the optimization of these variables is discussed. It is shown that bearing fatigue of M50 increases by increasing hardness, decreasing surface, and increasing grain size. The optimum life identified occurs at Rc 64 hardness, 1.5 RMS surface finish, and a grain size of ASTM 2.
