Download or read book Correlation of Microstructure and Fracture Toughness in Two 4340 Steels written by Sunghak Lee and published by . This book was released on 1986 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Correlation of Microstructure with the Strength and Fracture Toughness of Pearlitic Steels written by B. E. O'Donnelly and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantitative correlation of microstructure and fracture toughness for high strength steels and their welds 355 890 MPa contract no 7210 PR 312 1 July 2001 to 30 June 2004 final report written by W. Bleck and published by . This book was released on 2006 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Correlation of Microstructure with the Strength and Fracture Toughness of Pearlitic Steels written by B. E. O'Donnelly and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microstructue and Mechanical Properties of AISI 4340 Steel Modified with Aluminum and Silicon written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of additions of aluminum and combinations of aluminum and silicon to AISI 4340 steels was investigated. The mechanical properties such as strength, fracture toughness (K/sub Ic/), and impact toughness (C/sub v/) were obtained for the modified steels in the quenched and tempered condition. The microstructure was characterized using optical and transmission electron microscopy. The fracture surfaces and inclusions were characterized using scanning electron microscopy and an energy dispersive analysis of x-rays unit. It was observed that the softening which normally occurs on tempering AISI 4340 steel was retarded by additions of either aluminum or combinations of aluminum and silicon. The effect of aluminum on the tempering reactions in steel appeared to be similar to that of silicon. The tempered martensite embrittlement phenomenon in AISI 4340 steel occurred at higher tempering temperatures in the presence of silicon and/or aluminum. Significant improvements in the strength and toughness of quenched and tempered 4340 steel were obtained through silicon and/or aluminum additions. An attempt was made to correlate microstructure with the observed mechanical properties. The fracture surfaces features associated with the initiation of fast fracture for all the heat treated conditions investigated indicated that the operative fracture mode was complex.
Download or read book The correlation of microstructure with strength and fracture toughness in pearlitic rail steels written by F. P. L. Kavishe and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlations Between Fracture Toughness and Microstructure in 4140 Steel written by Trond K. Odegaard and published by . This book was released on 1979 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steel Forgings written by Edward G. Nisbett and published by ASTM International. This book was released on 1997 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprises 25 papers from the November 1996 symposium in New Orleans. The papers explore four subject areas: pressure vessel and nuclear forgings, general industrial forgings, test methods, and turbine and generator forgings. Specific paper topics include: new materials and forgings used for pressure
Download or read book Influence of Microstructure and Second Phases on Fracture Toughness written by G. T. Hahn and published by . This book was released on 1975 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microstructure and Fracture Toughness of Cast and Forged Ultra High Strength Low Alloy UHSLA Steels written by J. Buchar and published by . This book was released on 1990 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes the fracture toughness and microstructure relations for ultra-high-strength, low-alloy (UHSLA) steels corresponding to AISI 4340 composition. The steels were either cast or forged, heat treated at austenitizing temperatures from 840 to 1100°C, oil quenched and tempered at 180 and 650°C. Fracture toughness, tensile, and Charpy impact toughness tests, and testing of apparent fracture toughness under the influence of notch root radius, were performed simultaneously. Investigation of microstructures and corresponding mechanical properties, as well as fractographic examinations and evaluation of chemical heterogeneity, made it possible to elucidate the alteration of fracture behavior.
Download or read book The Relationship of Microstructure to Strength and Toughness in High strength Steel written by Y. H. Liu and published by . This book was released on 1963 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research deals with the relationship between the microstructural features and the susceptibility to brittle fracture of six selected commercially produced ultra-high strength steels. The parameters selected for the susceptibility to brittle fracture were the susceptibility to plastic instability, indicative of the susceptibility to ductile fracture initiation, and controlled total available energy bend test to determine the conditions for acceleration of crack propagation and the energy absorbed in rapid crack propagation. The microstructures were studied by standard techniques of optical microscopy, electron microscopy, and electron diffraction.
Download or read book Crack Arrest Toughness of 4140 1340 and 4340 Steel written by and published by . This book was released on 1981 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: In an earlier study, the crack arrest fracture toughness of 4140 and 4340 steel was measured as a function of yield strength and test temperature. The yield strength was varied over the range of 140 to 180 ksi, and the temperature from -65 to +165F, the ranges of most interest for armament materials. Both materials were evaluated with full-thick specimens using one- inch thick plates. In this thickness, 4340 through hardens, while 4140 does not, so that the toughness difference reported for these two materials was a result of both composition and microstructure differences. The present study was undertaken to add 1340 steel to the comparison. However, to avoid having mixed microstructures, the 1340 and two new heats of 4140 steel were heat treated in thinner sections so that they would be martensitic through their thickness.
Download or read book Relationship Between Fracture Toughness and Fracture Surface Fractal Dimension in AISI 4340 Steel written by Luis Ramos Carney and published by . This book was released on 2006 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1986 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlations Between Fracture Toughness and Microstructure in 4140 Steel MRL E 113 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Correlations between the microstructure of an ultra-high strength steel and material resistance to fracture, as measured by blunt notch Charpy impact tests and sharp crack K/sub IC/ tests, were investigated for a standard 870°C/oil and an experimental 1175°C/oil austenitizing treatment. The increase in sharp crack toughness with higher temperature austenitizing treatments, for the as-quenched and 200°C/oil temper conditions, was rationalized by a fracture criterion based on the notion that for fracture to occur, a critical strain, epsilon/sub f/, must be achieved over some critical distance, delta. The lath colonies were identified as the fracture controlling microstructural unit, and hence, their size was considered to be the critical distance, delta. Toughness in the 300°C/l hour and 400°C/l hour temper conditions, for which the mechanical data indicated an embrittlement, was clearly controlled by the cementite morphology in conjunction with the prior austenite grain size. Attempts to rationalize toughness in these temper conditions, using a stress-controlled fracture criterion, were unsuccessful and led to physically unreasonable results. In the 500°C/l hour temper condition, stable crack growth and periodic ridge patterns were observed. Fracture toughness differences between the 870°C and 1175°C austenitizing treatments were qualitatively rationalized by the nature of the respective fracture morphologies. Good correspondence between J/sub IC/ and the so-called tearing modulus, T, as indicators of sharp crack fracture toughness, was observed.
Download or read book Microstructure and Mechanical Properties of AISI 4340 Steel Modified with Aluminum and Silicon written by Manjeshwar Shanthidas Bhat and published by . This book was released on 1977 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Application Engineering to Determine the Effect of Processing Variables on Crack Propagation of High strength Steels and Titanium written by B. R. Banerjee and published by . This book was released on 1963 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes in detail the fine structural characterizing of several high-strength steels (AISI 4340, Type H-11 (Crucible 218), Type 422 stainless, work-hardened Type 301 stainless, PH15-7Mo semiaustenitic stainless, and B-120VCA beta titanium alloy) and gives the relationship of these structures to smooth and notch strength properties. The fine structures of these materials were characterized and correlated with strength and fracture properties to an extent never before achieved.
