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首页> 外文期刊>Journal of Materials Engineering and Performance >Fatigue and Fracture Behavior of Induction-Hardened and Superimposed Mechanically Post-treated Steel Surface Layers
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Fatigue and Fracture Behavior of Induction-Hardened and Superimposed Mechanically Post-treated Steel Surface Layers

机译：诱导和叠加机械后处理钢表面层的疲劳和骨折行为

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摘要

This paper focuses on the effect of induction hardening and superimposed stroke peening, as mechanical post-treatment, on the fatigue and fracture behavior of gas engine 50CrMo4 steel crankshafts. Comprehensive analysis in regard to local microstructure, hardness and residual stress profile in depth is performed to examine the local characteristics of the investigated crankshafts and the representative notched round specimens. An evaluation of the equivalent von Mises residual stress condition in depth demonstrates an increase by over 70% of the average compressive residual stress state due to the superimposed stroke peening compared to the induction-hardened condition. Rotating bending fatigue tests reveal that the additional stroke-peening process elevates the high-cycle fatigue strength of the induction-hardened surface layer by 20%, which validates the beneficial effect of the enhanced compressive residual stress state. An extensive fracture surface analysis presents the position of crack initiation for each investigated manufacturing condition indicating that the failure origin preferably starts at the surface for higher load levels. On the contrary, the crack initiation shifts beneath the hardened layer in case of lower load levels leading to subsurface failure origin.
机译：本文侧重于感应硬化和叠加中风喷丸的效果，作为机械后处理，对燃气发动机50crmo4钢曲轴的疲劳和断裂行为。关于局部微观结构的综合分析，进行深度深度的硬度和残余应力分布，以检查所研究的曲轴和代表性缺口圆形样品的局部特征。对等同von误差残余应力条件的评估深入显示出由于与感应硬化条件相比叠加的行程喷丸而增加了超过70％的平均压缩残余应力状态。旋转弯曲疲劳试验表明，额外的行程灌注过程将感应硬化表面层的高循环疲劳强度升高20％，这验证了增强的压缩残余应力状态的有益效果。广泛的裂缝表面分析呈现出每个研究的制造条件的裂纹引发的位置，表明故障原点优选在表面处开始以进行更高的负载水平。相反，在较低的负载水平导致地下故障起源的情况下，裂纹启动在硬化层下方移位。

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