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Surface-hardened Layer Properties of Newly Developed Case-hardening Steel

机译：新型表面硬化钢的表面硬化层性能

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The effects of fine-particle peening conditions on the surface-hardened layer properties of newly developed case-hardening steel, i.e. , transformation-induced plasticity-aided steel with a chemical composition of 0.2% C, 1.5% Si, 1.5% Mn, 1.0% Cr, 0.2% Mo, and 0.05% Nb (mass%) were investigated for the fabrication of automotive drivetrain components. The surface roughness decreased with decreasing arc-height of fine-particle peening after vacuum carburization. A white layer developed on the surface of the steel peened at arc-heights greater than 0.41 mm (N). The maximum Vickers hardness and maximum compressive residual stress increased with increasing arc-height in the steel. These values were higher than those of commercial case-hardening steels. The increased volume fraction and expansion strain of the strain-induced martensite increased the hardness and compressive residual stress in the surface-hardened layer of the steel, although severe plastic deformation made a substantial contribution to enhancing the surface-hardened layer properties.
机译：细喷丸条件对新开发的表面硬化钢的表面硬化层性能的影响。 ，研究了化学成分为0.2％C，1.5％Si，1.5％Mn，1.0％Cr，0.2％Mo和0.05％Nb（质量％）的相变诱发塑性辅助钢用于汽车传动系统组件的制造。真空渗碳后，随着粗糙度的提高，表面粗糙度降低。在钢表面上形成的白色层，其电弧高度大于0.41 mm（N）。最大维氏硬度和最大压缩残余应力随着钢中电弧高度的增加而增加。这些值高于商业表面硬化钢的值。应变引起的马氏体的体积分数和膨胀应变增加，虽然严重的塑性变形为增强表面硬化层的性能做出了重要贡献，但钢的表面硬化层的硬度和压缩残余应力却增加了。

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