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8620

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Published: 30 September 2014
Fig. 9 Chart for plotting 8620 steel test pin variation by characteristic. (a) Effective case depth characteristic. (b) Surface hardness characteristic. (c) Center core hardness characteristic. (d) Chart to plot data from (a), (b), and (c) by cycle and furnace More
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Published: 30 September 2014
Fig. 81 Micrograph of grinding cracks in case-hardened 8620 steel showing small cracks (see small arrows) passing through the hardened case to the core, and the burned layer on the surface (dark band with arrow at the left) that resulted in grinding burns. (Note: nital and acidic ferric More
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Published: 30 September 2014
Fig. 39 Jominy end-quench curves of AISI 1045 and 8620. Source: Ref 13 More
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Published: 01 October 2014
Fig. 13 Auger electron spectra from case fracture surfaces of carburized 8620 steel. (a) From transgranular fracture surface. (b) From intergranular fracture surface. Source: Ref 17 More
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Published: 01 October 2014
Fig. 16 Schematic of carbon concentrations at the corners of an 8620 steel specimen subjected to carburizing and diffusion at 1050 °C (1920 °F). Based on chemical analysis of chips milled from various locations of the specimen. Source: Ref 49 More
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Published: 01 October 2014
Fig. 18 Corner and plane surface microhardness profiles from 8620 steel specimen carburized at 930 °C (1700 °F). Source: Ref 48 More
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Published: 01 October 2014
Fig. 32 End-quench hardenability of carburized 8620 steels with variation in chromium content. (a) 8620 with 0.21 wt% Cr. (b) 8620 with 0.031 wt% Cr. Bars normalized at 925 °C (1700 °F). Core was austenitized for 20 min at 925 °C (1700 °F). Case was pack carburized for 9 h at 925 °C (1700 °F More
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Published: 01 December 2008
Fig. 14 Six gates were required to produce this gimbal ring, an 8620 steel investment casting. By increasing the size of the ribs, four gates were eliminated and cost was decreased 28%. More
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Published: 30 September 2015
Fig. 20 Single tooth bending fatigue test of AISI 8620 wrought steel and surface densified gears (alloy DM-222). Courtesy of PMG More
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Published: 30 September 2015
Fig. 21 Back-to-back fatigue testing of AISI 8620 wrought steel and surface densified gears (alloy DM-222). Failure mode is bending fatigue. Courtesy of PMG More
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Published: 01 August 2013
Fig. 19 Load configuration for low-pressure carburizing of ball screws. SAE 8620; carburizing temperature, 960 °C (1760 °F); nitrogen, 20 bar (15,000 torr); case-hardening depth, 1.4–1.65 mm (0.055–0.065 in.). Source: Ref 14 More
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Published: 01 August 2013
Fig. 8 Carbon, nitrogen, and hardness gradients for carburized 1018 and 8620 steels. See text for processing details. More
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Published: 01 August 2013
Fig. 13 Residual surface stresses for automotive pinion made of 1018 and 8620 steels. IQ, intensive quenching More
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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 More
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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 More
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Published: 01 August 2013
Fig. 1 Representative carbon profile on an AISI 8620 steel rod of approximately 25 mm (1 in.) diameter after carburizing at 950 °C (1750 °F) for 12 h in an enriched endothermic atmosphere. The rod was subsequently austenitized at 850 °C (1560 °F) and oil quenched, untempered. Courtesy More
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Published: 01 August 2013
Fig. 43 Summary of reported Jominy tests by several laboratories on an (a) SAE 8620 steel and a (b) 4140 steel of approximately the same composition and grain size. Source: Ref 34 More
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Published: 01 August 2013
Fig. 6 Summary of reported Jominy tests by several laboratories on SAE 8620 steel of approximately the same chemical composition and grain size. Source: Ref 7 More
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Published: 01 August 2013
Fig. 4 Jominy hardenability of carburized 8620 steel. (a) Reheat quench. All bars normalized at 925 °C (1700 °F). Core: austenitized 20 min at 845 °C (1550 °F). Case: pack carburized 9 h at 925 °C (1700 °F), box cool; reheated 20 min at 845 °C (1550 °F), quenched. (b) Direct quench. All bars More
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Published: 01 October 2014
Fig. 23 An SAE 8620 gear was running 100% scrap in carburizing and hardening, with taper in the teeth of as much as 0.09 mm (0.0035 in.). Production was satisfactory when stock was added to back up the teeth (as shown in the schematic), and six holes were added to improve the flow of quenching More