Download or read book An Investigation of the Effect of a Coating of Petroleum Derivative Oils on the Fatigue Life of an Oil Hardened Tool Steel written by Navnit M. Panchal and published by . This book was released on 1969 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of the Effect of Gaseous Atmospheres of Oxygen Argon and Nitrogen on the Fatigue Life of an Oil Hardening Tool Steel in Completely Reversed Bending at Room Temperatures written by Ajit Somabhai Patel and published by . This book was released on 1971 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Master s Theses and Doctoral Dissertations in the Pure and Applied Sciences written by and published by . This book was released on 1970 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Fatigue of Tool Steels Having a Surface Coating written by S. S. KRUGLIKOV and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: CONCLUSIONS: The fatigue strength of chrome tool steel is substantially reduced as a result of applying a metallic coating by spraying, dipping, or electrolysis. The decrease occurs before and after holding the steel at an elevated temperature. Shot-peening or nitriding the surface of steel prior to application of a coating considerably increases the fatigue strength of the coated specimens. This effect also occurs after holding the coated specimens at elevated temperatures. Aluminum-silicon paint does not substantially effect the fatigue of steel. (Author).
Download or read book An Experimental Investigation of the Size Effect on the Torsional Endurance Limit of an Oil Hardening Tool Steel written by Nuggehalli Tirumalachar Vasuki and published by . This book was released on 1976 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of the Size and Shape Effect on the Endurance Limit Stress of Oil Hardening Tool Steel written by Lalji Keshavbhai Satashia and published by . This book was released on 1975 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fundamental Relationship Between Tool Wear Surface Integrity and Fatigue in Milling of Difficult to cut Alloys written by Wei Li and published by . This book was released on 2013 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tool wear is the critical factor to determine machining economy since it is directly related to tool life and the overall cost of production. Surface integrity (surface finish, microstructure, residual stress, microhardness, and surface chemistry) and service performance (e.g. fatigue life) of machined components can be also adversely affected by tool wear because they deteriorate to an unacceptable level with the progression of tool wear. Therefore, it is necessary to understand and establish the basic relationship between tool wear, surface integrity, and fatigue performance in order to give a general guidance for producing as many quality parts as possible while minimizing machining costs. This study starts with a critical assessment of literature on surface integrity in machining of difficult-to-cut alloys. To significantly improve the accuracy and repeatability of tool wear measurement, a novel online optical tool inspection system has then been developed to integrate with a CNC machining center to monitor tool wear in milling. The progression of tool flank wear of PVD coated inserts in end milling of AISI H13 tool steel and Inconel 718 superalloy were presented to demonstrate the function of the optical tool inspection system. A Taguchi design-of-experiment based dry finish milling of AISI H13 tool steel (50 ± 1 HRc) with (Ti, Al)N/TiN coated cutting tools was conducted to investigate the process-induced surface integrity. The mechanism of surface integrity in hard milling was investigated to understand the effects of mechanical/thermal loads on surface microstructure and properties. The microstructure, microhardness and residual stresses were characterized. A phase transformed white layer was not observed in the context of concerned process parameters. The milled surfaces are characterized by the increased microhardness and high compressive residual stresses, which are beneficial for improving fatigue performance and wear resistance of the machined components. Finally, the process design space for the desired surface integrity has been established via the microhardness and residual stress maps. By using the online optical tool inspection system, tool wear effect on surface integrity and fatigue life of AISI H13 tool steel by dry hard milling using PVD coated tools are studied. The evolutions of surface integrity were characterized at different levels of tool flank wear. At each level of tool flank wear, the effects of cutting speed, feed, and radial depth-of-cut on surface integrity were investigated respectively. It shows that surface roughness in the step-over direction is much higher than that in the feed direction under all the milling conditions. The increased tool wear did not necessarily produce a rougher surface in both directions. Optical images of the subsurface microstructure of the machined samples do not show a noticeable white layer or heat affected zones which may be explained by the characteristic of periodic tool/work contact in milling compared to turning and grinding. Residual stresses are compressive in both directions and are more compressive in the step-over direction than the feed direction. Four-point bending fatigue tests were performed using the samples machined at different flank wear conditions. The results show that generally a worn tool reduces fatigue life, and the larger the tool wear, the shorter the fatigue life. The fractured surfaces of fatigued samples were characterized. Fatigue endurance limits of the machined surfaces at different reliability levels were estimated and correlated with the experimentally determined fatigue life. Tool wear effect on surface integrity and fatigue life of Inconel 718 superalloy by milling using PVD coated tools are also studied. The evolutions of surface integrity including surface roughness, microstructure, and microhardness were characterized at three levels of tool flank wear (VB = 0, 0.1 mm, 0.2 mm). At each level of tool flank wear, the effects of cutting speed, feed, and radial depth-of-cut on surface integrity were investigated respectively. End milling can produce surface finish between 0.1 μm and 0.3 μm under most of the conditions. Roughness is generally higher in step-over direction than feed direction. No obvious white layer is observed in subsurface microstructure. The machined surface is significantly work-hardened due to the dominant mechanical loading. Four-point bending fatigue test shows that none of the milled samples failed within four million cycles. Fatigue endurance limits of the machined samples at different reliability levels were calculated and correlated with the experimentally determined fatigue life.
Download or read book Studies on the Fatigue Strength of Aluminum Coated Steel 1st Report The Effect of Aluminum Coatings Method on the Fatigue Strength written by S. Tobe and published by . This book was released on with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Fibre Orientation on the Fatigue Strength of Hardened Steel written by National Research Council of Canada. Division of Building Research and published by . This book was released on 1959 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1996 with total page 1628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Phosphate Coatings on Fatigue Crack Initiation in Quenched and Tempered Low Alloy Steel written by R. Farrara and published by . This book was released on 1990 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Protective Coatings on the Corrosion fatigue Strength of Steel written by Hugh Henry Benninger and published by . This book was released on 1939 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Surface Active Lubricants on the Contact Fatigue Life of Hardened Ball Bearing Steel written by G. V. Karpenko and published by . This book was released on 1970 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The addition of up to 0.2 percent stearic acid to industrial oils reduced the contact fatigue limit of steels. Concentrations of 0.2-0.3 percent had no effect. The effect of steric acid addition was reduced on steels of higher purity. (Author).
Download or read book The Impact of Machining on the Fatigue Life of Annealed M 2 Tool Steel written by Tien Fu Chang and published by . This book was released on 1978 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Wear Resistant Coatings on the Fatigue Strength of 4340 Steel written by ER. Duffy and published by . This book was released on 1998 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: For applications using 4340 steel where hardened surfaces are required in a marine environment, surface coatings are necessary. Coatings that resist corrosion and provide wear resistance generally degrade the fatigue performance of the substrate metal. Shot peening before plating was ineffective in preventing a loss of fatigue life of plated steel bars compared to bare steel test bars which were not shot peened. The maximum residual compressive strength produced by shot peening was measured and was less than the maximum applied tensile stress in fatigue. As-plated electroless nickel has poor sliding wear resistance compared to either electroplated nickel or chromium in sliding wear at a contact stress of 37 Mpa. The tensile strength decreased in proportion to the volume fraction of coating applied to the steel substrate.
Download or read book Tool Life and Surface Integrity When Hard Turning Stainless Steel Using Wiper Coated Carbide Tool written by Denni Kurniawan and published by GRIN Verlag. This book was released on 2012-05-22 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master's Thesis from the year 2008 in the subject Engineering - Mechanical Engineering, grade: Satisfactory, University College of Technology and Innovation, Malaysia (Universiti Teknologi Malaysia), language: English, abstract: The feasibility of implementing hard turning partially depends on the performance of the cutting tool in generating the required machined parts. Since process efficiency is a continuous pursue, there is always a need of having inexpensive cutting tools able to deliver the expected quality of machined surfaces and having reasonable life times. For this purpose, the selection of cutting conditions and its performance are important. In this study, a carbide tool with TiAlN coating is proposed as the low cost alternative for performing moderate range of hard turning. Specifically, a coated carbide tool with wiper geometry was used to machine hardened martensitic stainless steel (47 - 48 HRC). The tool's performance is evaluated based on its tool life and the resulting surface finish when hard turning at various cutting speeds (100, 130, and 170 m/min) and feeds (0.125, 0.16, 0.2, and 0.25 mm/rev) and at constant depth of cut of 0.4 mm under dry condition. Further observation was made on the worn tool, the machined surface, and the generated chip. The wiper coated carbide tool lasts mostly beyond 2 minutes and even reaches a maximum of almost 18 minutes of service life time. Combination of abrasion and diffusion are suggested to be the main wear mechanisms of the cutting tool. The resulting surface finish is very fine, being entirely finer than 0.8 μm in Ra which is one level better than the theoretically expected value. Empirical models are developed to quantify the effect of cutting speed and feed to the tool life and Ra. Further observation at the optimum process parameter combination, for example the lowest cutting speed-lowest feed, reveals minimum machining-induced surface microstructure alteration and compressive residual stress on the mac
Download or read book An Investigation of the Effect of Fatigue on the Core Losses of Steel written by James Alden Knowles and published by . This book was released on 1945 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
