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case depth
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Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005795
EISBN: 978-1-62708-165-8
... Abstract Case depth is the normal distance from the surface of the steel to the start of the core. Measurement of case depth is highly sensitive to the type of case hardening, original steel composition, quenching condition, and even to the testing method. This article describes the various...
Abstract
Case depth is the normal distance from the surface of the steel to the start of the core. Measurement of case depth is highly sensitive to the type of case hardening, original steel composition, quenching condition, and even to the testing method. This article describes the various methods of measuring case depth in steels, including chemical methods such as the combustion analysis and spectrographic analysis, microhardness test method, macroscopic and microscopic visual methods, and nondestructive methods. It contains a table that provides approximate equivalent hardness numbers for steel.
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Published: 01 October 2014
Fig. 5 Case depth measurement in a gear profile, where δc is the total case depth, and δτ is the depth at the point of maximum shear stress. Source: Ref 3
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Published: 01 October 2014
Fig. 5 The case depth needed to preclude case crushing is determined by first finding the cooling rate at the indicated point. The steel, carbon level, and required depth to 50 HRC are then ascertained as described in the text.
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Published: 01 August 2013
Fig. 8 Comparative case-depth and case-hardness data obtained for liquid carburizing process-control specimens made of three steels. (a) Data are for 11 mm diam by 6.4 mm (0.4375 in. diam by 0.25 in.) specimens carburized 2 h at 855 °C (1575 °F), brine quenched and tempered at 150 °C (300 °F
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Published: 01 December 1998
Fig. 11 Reproducibility of case depth in 8620 steel, using the criterion of depth to 0.40% C. Data points, representing individual heats, are plotted in chronological order (left to right). Data were collected in studies in two different plants. Legend for parts (b) and (c): ○, furnace
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Published: 01 January 2002
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Published: 30 September 2014
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in Fatigue Resistance of Steels
> Properties and Selection: Irons, Steels, and High-Performance Alloys
Published: 01 January 1990
Fig. 21 Effect of case depth on fatigue life. Fatigue tests on induction-hardened 1038 steel automobile axle shafts 32 mm (1 1 4 in.) in diameter. Case depth ranges given on the chart are depths to 40 HRC. Shafts with lower fatigue life had a total case depth to 20 HRC of 4.5 to 5.2
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Published: 01 August 2013
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Published: 01 August 2013
Fig. 2 Comparison of case-depth measurements on a sample of 8620 steel with core hardness of 30 HRC and 0.90% surface carbon in five different laboratories
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Published: 01 August 2013
Fig. 3 Comparison of case-depth measurements on a sample of 8620 steel with core hardness of 40 HRC and 0.90% surface carbon in five different laboratories
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Published: 01 August 2013
Fig. 15 Comparison of effective case depth to 50 HRC measurements made on the same gears in two different laboratories
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Published: 01 August 2013
Fig. 17 Plot of expected measurement error as a function of effective case depth to 50 HRC derived from interlaboratory microhardness traverse gage repeatability and reproducibility study on samples with 1.3 and 3.2 mm (0.05 and 0.125 in.) effective case depth. A typical allowable range
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Published: 01 August 2013
Fig. 30 Comparison of required case depth versus current penetration depths in hot steel at various frequencies. Source: Ref 17
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in Modeling and Simulation of Steel Heat Treatment—Prediction of Microstructure, Distortion, Residual Stresses, and Cracking
> Steel Heat Treating Technologies
Published: 30 September 2014
Fig. 7 (a) Carbon distribution contour with case depth of 1.5 mm (0.06 in.). (b) Cross section and two straight lines selected for modeling result analysis. (c) Carbon distributions in terms of depth and increased geometry effect. ECD, effective case depth. Source: Ref 86
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Published: 01 January 1994
Fig. 25 Effect of laser processing speed and power output on case depth thickness of laser hardened 1078 carbon steel
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Published: 01 January 1994
Fig. 5 Hardness range as a function of case depth for four stainless steels that were annealed prior to nitriding. Annealing temperature: types 302 and 321, 1065 °C (1950 °F); type 430, 980 °C (1800 °F); and type 446, 900 °C (1650 °F)
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in Vertical Scanners, Horizontal Scanners, and Tooth by Tooth Scanners
> Induction Heating and Heat Treatment
Published: 09 June 2014
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in Vertical Scanners, Horizontal Scanners, and Tooth by Tooth Scanners
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 11 Scan speed as a function of the ratio of effective case depth (ECD) to the above-Curie depth of current penetration (ACD) of current penetration. D of I, depth of current penetration
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Published: 09 June 2014
Fig. 10 (a) Current versus time for interrupted quench tests. (b) Case depth data for interrupted quench tests
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