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本文以从西德引进的原套(未使用过)轴承为试样,分析研究了其化学成分、材料质量和渗层的组织结构、碳化物形态、表面含碳量及碳浓度沿渗层深度的分布;测定了其硬化层深度、残余内应力沿渗层深度的分布及表面残余奥氏体量等。试验分析结果表明,国内外轧机渗碳轴承用钢的成分、材质、性能基本相近,主要的质最差距是渗层的组织结构、表面含碳量和碳浓度分布、硬化层深度等有显著差别。并讨论了这些因素对轧机轴承使用性能的影响,提出了将渗碳-热处理和综合强韧化措施有机地结合起来的工艺制度,能大大改善和提高20CrNi4A钢制渗碳轴承质量。本文建议修改目前的特大型渗碳轴承的技术要求。
In this paper, the original sleeve (unused) bearing introduced from West Germany was used as a sample to analyze the chemical composition, material quality and structure of the infiltration layer. The carbide morphology, surface carbon content and carbon concentration along the depth of the infiltration layer The distribution of the depth of hardened layer, the distribution of residual internal stress along the depth of the infiltration layer and the amount of residual austenite on the surface were measured. The test results show that the composition, material and properties of the carburizing bearing steel used in the rolling mills at home and abroad are basically similar. The main quality and the most difference are the structure of the infiltrated layer, the surface carbon content, the carbon concentration distribution and the depth of the hardened layer . The influences of these factors on the bearing performance of the rolling mill are discussed. The system of combining carburizing - heat treatment and comprehensive strengthening and toughening measures is put forward, which can greatly improve and enhance the quality of 20CrNi4A steel carburized bearing. This paper proposes to modify the current technical requirements for large super-carburized bearings.