16MnCr5钢大马力柴油机凸轮轴渗碳淬火组织演变

通过光学显微镜、扫描电镜、XRD测试、硬度梯度测试等研究16MnCr5低碳合金钢凸轮轴渗碳淬火+低温回火后沿径向的显微组织和硬度。结果表明,940 ℃强渗适用于16MnCr5钢凸轮轴,显微组织沿凸轮轴径向变化明显,渗碳层表面组织为高碳的针状马氏体和10%左右的残留奥氏体,表层硬度可达750 HV,有效硬化层深度可达1.5 mm以上,基体组织为贝氏体和低碳马氏体的混合组织。

Microstructure evolution after carburizing and quenching of 16MnCr5 steel high power diesel engine camshaft

Microstructure and hardness along the radial direction of the 16MnCr5 low carbon alloy steel camshaft after carburizing and quenching and low temperature tempering process were studied by means of OM, SEM, XRD and hardness test. The results show that the 940 ℃ carburazing period is suitable for 16MnCr5 steel. Microstructure of the camshaft changes significantly along the radial direction, as the surface structure is high-carbon acicular martensite and 10% retained austenite with hardness reaching 750 HV and effective hardened layer depth of above 1.5 mm, and the matrix structure is a mixed structure of bainite and low carbon martensite.