一、前言在钢的渗碳淬火组织中,一般除了马氏体成分外还残留一些过冷奥氏体(r_R)。当钢中含有C、Si、Cr、Mo等合金元素,且合金元素含量越高时,淬火残留奥氏体越多。如所周知,r_R量一多,淬火硬度就下降,耐应性劣化,同时另件尺寸时效变化也大。可是另一方面,适量的r_R可增大渗碳硬化层的韧性,特别是有利于齿轮齿面应合而 I. INTRODUCTION In the carburizing and quenching of steel, some supercooled austenite (r_R) remains in addition to martensite. When the steel contains C, Si, Cr, Mo and other alloying elements, and the higher the content of alloying elements, the more retained austenite quenching. As we all know, r_R amount of more than one, the quenching hardness decreases, resistance to deterioration, while other parts of the size of the aging changes. On the other hand, however, an appropriate amount of r_R increases the toughness of the hardened carburized layer, and in particular,