论文部分内容阅读
一、前言普遍认为轴承钢的冶金质量是影响轴承寿命的重要因素之一,日本曾分析本国轴承钢与瑞典SKF及美国产品的差距后,认为SKF轴承寿命高的主要原因是轴承钢的碳化物颗粒细小和分布均匀性。洛阳轴承研究所对国内外七个厂家的GCr15型轴承钢材质对比表明,国内外GCr15型钢中,碳化物的含量基本相近均为15％左右。但国产钢退火组织的碳化物粒度、形态和分布较差,与国外SKF、高周波、山阳等钢材相比,碳化物颗粒较大,大小和分布不均匀。轴承钢球化退火主要目的是获得细小均匀分布的球状碳化物,改善切削性能,使淬火回火后获得适当数量的碳化物和马氏体组
I. Preface It is generally accepted that the metallurgical quality of bearing steel is one of the important factors that affect bearing life. Japan once analyzed the difference between its own bearing steel and Swedish SKF and American products, and considered that the main reason for the high bearing life of SKF bearings is the carbide of bearing steel Fine particles and distribution uniformity. Luoyang Bearing Research Institute of domestic and foreign manufacturers GCr15 bearing steel material comparison shows that at home and abroad GCr15 steel, the carbide content were similar to about 15%. However, the size, shape and distribution of the carbide in the domestic steel annealed are poor. Compared with the foreign SKF, high frequency and Sanyang steel, the carbide particles are larger and their size and distribution are not uniform. The main purpose of bearing steel ball annealing is to obtain small and even distribution of spherical carbides, improve the cutting performance, so that after quenching and tempering to obtain the appropriate number of carbide and martensite group