前言众所周知,45中碳调质用钢是机床行业中应用较广泛的材料,其要求的机械性能是通过热加工调质处理来达到的。由于45钢的淬透性差(淬硬层4～6mm),零件经调质后很难得到表里一致的强韧性综合的机械性能。经调质后的零件表面为索氏体组织,由于切削性能不好,给切削加工带来困难,使生产周期长,耗能多。为此工业发达国家早在七十年代就开始研制使用非调质钢。 Preface As we all know, 45 medium carbon steel is the machine tool industry, the more widely used materials, the mechanical properties required by thermal processing to achieve quenched and tempered. Due to the poor hardenability of 45 steel (hardened layer 4 ~ 6mm), the parts after quenching is hard to get consistent with the toughness of the comprehensive mechanical properties. After the quenched and tempered parts of the surface of the sorbite tissue, due to poor cutting performance, to cutting difficult, so that the long production cycle, energy consumption and more. As a result, industrialized countries started to develop and use non-quenched and tempered steel as early as the seventies.