40Cr钢大断面工件的淬火工艺及淬火组织  

Quenching Process and Microstructure of 40Cr Steel Parts with Large Section

作　　者：陈涛[1] 赵爱民[2] 樊红亮[2] 李晓刚[2] CHEN Tao ZHAO Aimin FAN Hongliang LI Xiaogang(Hebei College of Industry and Technology,Shijiazhuang 050091 ,China Institute of Metallurgical Engineering, University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]河北工业职业技术学院,河北石家庄050091 [2]北京科技大学冶金工程研究院,北京100083

出　　处：《热加工工艺》2017年第2期201-204,共4页Hot Working Technology

基　　金：河北工业职业技术学院应用研发中心项目(2015YF01);河北省科技计划项目(15211031)

摘　　要：设计了40Cr钢的端面淬火工艺,研究了φ110 mm工件断面从表层到心部淬火后的组织,并测试了从表层到心部的硬度分布。结果表明:40Cr最佳淬火工艺为淬火3 min后250℃回火;按照此淬火工艺,φ110 mm工件断面淬火后淬硬层硬度为53~55 HRC,半马氏体深度为5~10 mm。在距表面深度超过15 mm后,马氏体消失,显微组织主要为片层状珠光体+先共析铁素体,硬度下降到表面硬度的1/2。The end surface quenching process of 40Cr steel was designed, and quenched microstructure of the section was studied from the surface to the core of Ф110 mm workpiece. And hardness distribution was measured from the surface to the core. The results show that the optimum end surface quenching process of 40Cr steel is quenching for 3 min and tempering at 250 ℃; according to the quenching process, the hardness of hardened layer of Ф110 mm workpiece section after quenching is 53-55 HRC, and the depth of halfmartensite layer of Ф110 mm parts is 5-10 mm. When the depth of the parts from surface is more than 15 mm, the martensite disappeares, the microstructure is mainly lamellar pearlite and proeutectoid ferrite, and the hardness decreases to 1/2 of surface hardness.

关 键 词：淬火组织 半马氏体 耐磨钢 40CR钢 

分 类 号：TG156.3[金属学及工艺—热处理]