大断面高碳铬轴承钢的微观组织设计与制备工艺研究

Research on Microstructure Design and Preparation Technology of Large Section High Carbon Chromium Bearing Steel

高碳铬轴承钢含有较高的碳元素,很容易析出粗大且不均匀分布的渗碳体组织,严重影响了钢的塑性。对于传统的中厚尺寸轴承钢,通常使用控轧控冷工艺和球化退火工艺来降低渗碳体的尺寸,但对于大断面轴承钢,这两种工艺很难渗碳到钢的心部,对提升钢的塑性不明显。因此,为了提高大断面轴承钢的塑性,从微观组织和强化机理出发,对微合金元素添加工艺和梯度纳米化工艺进行了研究,分析了未来的研发重点。

High carbon content in the high carbon chromium bearing steelmakes it easy to precipitate coarse and non-uniform distribution cementite,which seriously affects the plasticity of steel.For the traditional medium and thick bearing steel,the controlled rolling-cooling process and spheroidizing annealing process are usually used to reduce the cementite size,but for large section bearing steel,these two processes are difficult to carburize to the heart of the steel,and the plasticity of the lifting steel is not obvious.Therefore,in order to improve the plasticity of large-section bearing steel,the micro-alloying element addition process and gradient nano-process were studied from the perspective of microstructure and strengthening mechanism,and the future research and development priorities were analyzed in this paper.