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Metals 2017, 7(9), 375; doi:10.3390/met7090375

Torsional Fatigue Strength of Newly Developed Case Hardening TRIP-Aided Steel

1
School of Science and Technology, Shinshu University, 380-8553 Nagano, Japan
2
Institute for Materials Research, Tohoku University, 980-8557 Sendai, Japan
3
Ichinomiya Works, Sintokogio, Ltd., 441-1205 Toyokawa, Japan
*
Author to whom correspondence should be addressed.
Received: 4 August 2017 / Revised: 13 September 2017 / Accepted: 13 September 2017 / Published: 15 September 2017
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Abstract

The torsional fatigue strength of newly developed case hardening steel, i.e., transformation-induced plasticity-aided martensitic steel subjected to vacuum carburizing followed by fine particle peening, was investigated for the fabrication of downsized precision gears with high torque capacity and wear resistance. The surface-hardened layer properties—i.e., high Vickers hardness, high compressive residual stress, and a large amount of retained austenite—considerably increased the torsional fatigue limits of vacuum-carburized and fine particle peened TM and JIS-SNCM420 steels, although the notch-sensitivity to fatigue was increased. The relation between torsional and rotational bending fatigue limits for the smooth specimens was found to be between the maximum principal stress and the minimum shear strain energy criterions. On the other hand, this relation for the notched specimens was represented through the maximum principal stress criterion. View Full-Text
Keywords: torsional fatigue; vacuum carburization; fine particle peening; case hardening steel; TRIP-aided steel torsional fatigue; vacuum carburization; fine particle peening; case hardening steel; TRIP-aided steel
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Sugimoto, K.-I.; Hojo, T.; Mizuno, Y. Torsional Fatigue Strength of Newly Developed Case Hardening TRIP-Aided Steel. Metals 2017, 7, 375.

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