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case hardness

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850334
EISBN: 978-1-62708-260-0
... D. : “ Mohs’s Hardness Scale—A Physical Interpretation, ” Proc. R. Soc. , London , vol. 67 , sect. B, 1954 , pp. 249 – 257 . 10.1088/0370-1301/67/3/310 32. Bierbaum C. H. : “ The Microcharacter; Its Application in the Study of the Hardness of Case-Hardened, Nitrided and Chrome...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720085
EISBN: 978-1-62708-305-8
... surface finish will yield erratic readings. Hence, when necessary, the surface of the workpiece should be filed, machined, ground, or polished to permit accurate, consistent readings to be obtained. Case hardened steels having cases as thin as 0.25 mm (0.010 in.) can be accurately hardness tested...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440027
EISBN: 978-1-62708-262-4
... made to obtain the listed values. Table 2 Rockwell standard hardness scales Scale symbol Indenter Major load, kgf Typical applications A Diamond (two scales—carbide and steel) 60 Cemented carbides, thin steel, and shallow case-hardened steel B 1.588 mm ( 1 16 in...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410335
EISBN: 978-1-62708-265-5
... strength, including the austenitic grain size or packet size (in this case, austenite grain size was roughly constant, between ASTM 7 and 9), lath size, and dislocation fine structure. Equations 16.1 and 16.2 are based on yield strength. Ultimate tensile strengths and hardness are strongly dependent on...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310079
EISBN: 978-1-62708-326-3
... the cooling rate to produce a specific structure (50% martensite). Knowing J d for a steel and the H -value of the quenching medium, one can predict the depth of hardening in any size bar. Measuring cooling rates is obviously impractical or, in many cases, impossible, and so the unique correlation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770135
EISBN: 978-1-62708-337-9
... core properties including hardenability, microstructure, tensile and yield strength, ductility, toughness, and fatigue resistance. It likewise explains how carbon affects case hardenability, surface hardness, and case toughness and how case depth influences residual stresses and bending and contact...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440141
EISBN: 978-1-62708-262-4
... are discussed. carbonitriding carburizing case hardening nitriding nitrocarburizing steel CASE HARDENING—the production of parts that have hard, wear-resistant surfaces, but with softer and/or tougher cores—can be accomplished by two distinct methods. One approach is to use a grade of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130351
EISBN: 978-1-62708-284-6
... Abstract This chapter presents various case histories that illustrate a variety of failure mechanisms experienced by the high-strength steel components in aerospace applications. The components covered are catapult holdback bar, AISI 420 stainless steel roll pin, main landing gear (MLG) lever...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290201
EISBN: 978-1-62708-319-5
.... , Dearhouse P.H. , and Case E.D. , Microwave Sintering of Alumina Using Four Single-Cavity Modes , J. Mater. Synth. Process. , Vol 7 , 1999 , p 159 – 166 10.1023/A:1021817229402 • Lee J.W. , Jaffrey D. , and Browne J.D. , Influence of Process Variables on Sintering of WC-25wt...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130177
EISBN: 978-1-62708-284-6
..., dimensional stability, and generation of quenching and grinding cracks. They also include insufficient case hardness and improper core hardness, influence of surface carbon content and grain size, internal oxidation, structure of carbides, and inclusion of noncarbide. Details on micropitting, macropitting...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260187
EISBN: 978-1-62708-336-2
... butt thickness is small compared with the diameter of the billet. Rapid radial metal flow ( Fig. 4b ) into the die results in the creation of axial holes, or funnels, in the back of the extrusion, especially in the case of heavy extrusion (low extrusion ratio), where this type of radial flow could be...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130133
EISBN: 978-1-62708-284-6
... Abstract This article presents six case studies of failures with steel forgings. The case studies covered are crankshaft underfill; tube bending; spade bit; trim tear; upset forging; and avoidance of flow through, lap, and crack. The case studies illustrate difficulties encountered in either...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430409
EISBN: 978-1-62708-253-2
... pathways, and relevant test and measurement procedures. It describes life assessment methods based on hardness, wall thickness, scale formation, microstructure, and creep. It also includes a case study on the determination of the residual life of a secondary superheater tube. boiler tubes remaining...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770171
EISBN: 978-1-62708-337-9
... content case hardness contact fatigue core hardness quenching refrigeration retained austenite tempering wear resistance Thermal treatments, such as tempering and refrigeration (subzero cooling), performed on case-hardened parts subsequent to quenching are considered necessary by some to...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770001
EISBN: 978-1-62708-337-9
... provide a surface that is hard. Regrettably, this is no indication that the case-hardening process has been successful. Additional microstructural features may exist along with, or instead of, the aimed-for martensite, and these indeed can significantly influence the properties of the component, thereby...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770077
EISBN: 978-1-62708-337-9
... Retained Austenite on Propagation of Fatigue Cracks in Carburised Cases of Toothed Elements , Heat Treatment ’84 , The Metals Society , p 39.1 – 39.9 9. Vasil’ev L.A. , Retained Austenite and Hardness of the Carburised Case on Steel 18Kh2N4VA after Quenching in Two Different Media , Met...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140039
EISBN: 978-1-62708-264-8
...; Rockwell, Brinell, Vickers, and Knoop hardness tests; and Charpy V-notch impact tests. The chapter also provides information on loading conditions that can lead to fatigue failure, and in some cases, counteract or prevent it. fatigue failure hardness test mechanical properties notched impact test...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270177
EISBN: 978-1-62708-301-0
.... Microhardness survey across the section showed a hardness equivalent of 59 to 62 HRC in the case and 36 to 37 HRC in the core. Fractographic features clearly indicated fatigue crack as the cause of fracture of the gear. The fatigue crack had initiated at the inner corner of the rim where an elongated MnS...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350195
EISBN: 978-1-62708-315-7
... operations may be required before or after processing and how to estimate or predict coating thickness, case depth, hardness, and the likelihood of distortion. It also addresses related issues and considerations such as part handling and fixturing, surface preparation and cleaning requirements...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500317
EISBN: 978-1-62708-317-1
... hardening, case (surface) hardening, and nitriding as well as hard chrome plating, vapor deposition, and thermal diffusion coating. It explains how to measure wear resistance using various tests and provides guidelines for selecting tool materials, treatments, and coatings. chemical vapor deposition...