GCr15SiAlMo贝氏体轴承钢球化退火工艺研究

发布时间：2018-05-10 12:02

本文选题：球化退火 + 轴承钢　；参考：《机械工程学报》2015年04期

【摘要】：通过对新型无碳化物贝氏体轴承钢-GCr15Si Al Mo的球化试验研究,优化出一种适于轴承钢的循环球化退火新工艺。利用扫描电镜对球化后的显微组织进行观察,用X射线衍射仪对碳化物类型进行分析。结果表明,GCr15Si Al Mo无碳化物贝氏体轴承钢具有优良的碳化物球化特性。试样通过四周期的循环球化退火(大约6 h)后,组织中的碳化物基本球化完全,但是在700℃等温10 h的普通球化退火处理试样中仍存在大量的片状碳化物,由此证明,循环球化退火工艺比普通球化退火工艺的球化速度更快,球化更完全。球化处理后钢中碳化物的平均直径均达到了0.55μm以下,直径在1μm以下的碳化物百分比在93%以上,甚至达到99%。同时研究表明,Al可有效提高轴承钢的A1点,抑制球化过程中网状渗碳体的生成,并且适量的Al还能够改善轴承钢的球化特性,抑制碳化物的长大。
[Abstract]:Through the study of the spheroidizing test of a new type of non carbide bainite bearing steel -GCr15Si Al Mo, a new process of spheroidizing annealing suitable for bearing steel was optimized. The microstructure of the spheroidizing was observed by scanning electron microscope and the type of carbide was analyzed by X ray diffractometer. The results showed that GCr15Si Al Mo was no carbide bainite. Bearing steel has excellent carbide spheroidization characteristics. After four cycles of cyclic spheroidizing annealing (about 6 h), the carbides in the tissue are basically spheroidizing, but there are still a large number of flake carbides in the normal spheroidizing annealed specimens at the temperature of 10 h at 700 degrees C. It is proved that the spheroidizing annealing process is better than the ordinary spheroidizing annealing. The spheroidization speed of the art is faster and the spheroidization is more complete. The average diameter of carbides in the steel is below 0.55 m, the percentage of carbides below 1 m is more than 93%, and even up to 99%., the study shows that Al can effectively improve the A1 point of bearing steel and restrain the formation of net carburized body in the process of spheroidizing, and a proper amount of Al It can also improve the nodular characteristics of bearing steel and inhibit carbide growth.

【作者单位】：燕山大学亚稳材料制备技术与科学国家重点实验室;燕山大学材料科学与工程学院;
【基金】：国家高技术研究发展计划资助项目(863计划,2012AA03A504)
【分类号】：TG161

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