不同渗硼时间下的45钢固体粉末渗硼渗层组织与性能研究
Study on Microstructure and Properties of Boride Layer of 45 steel under defferent solid boronizing time
吴开阳 崔 霞﹡ 欧阳德来 周贤良
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作者单位：南昌航空大学
中文关键字：固体粉末渗硼；渗层生长行为；组织性能
英文关键字：solid powder boronizing; boride Layer growth behavior; microstructure and property
中文摘要：本文以45钢为基材对其表面进行固体粉末渗硼，探讨渗层生长行为及渗硼时间与渗层组织及性能的关系。研究结果表明，渗硼层由硼化物Fe2B构成，硼化物以长短不齐的方式垂直楔入基体形成连续针齿状层，与基体牢固结合。随渗硼时间增大，渗层厚度先快速增大，后缓慢增加。渗层生长动力学符合抛物线规律。渗层显微硬度随渗层深度增加，先开始有所增加，后出现明显降低，最后缓慢降低。增加渗硼时间，渗硼深度增加，且显微硬度和耐磨性均能增加。
英文摘要：In this paper, the pack boronizing experiment was carried out on 45 steel surface with a method of solid powder boronizing, and the growth behavior of boronizing Layer and the relationship between microstructure and properties of boride Layer and boronizing time were investigated. The results show that the boride layer consists mainly of Fe2B. boride vertically wedge matrix forming a continuous layer, firmly bonded to matrix. With boronizing time increases, the thickness of boride layer increases fastly first, then slowly increases. the growth kinetic of boride Layer shows parabolic law. With boride Layer thickness increasing, the microhardness of boride layer increase first, then decrease obviously and finally decrease slowly. Boronizing time increasing, the thickness of boride layer increase, the hardness and wear resistance also increase.