65MnCr耐磨钢的淬透性及厚断面工件淬火组织  

Hardenability and quenched microstructure of wear resistant steel 65MnCr with thick section

作　　者：陈涛[1] 赵爱民[2] 樊红亮[2] 李晓刚[2] 姚舜[2] 

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：《材料热处理学报》2016年第11期129-134,共6页Transactions of Materials and Heat Treatment

基　　金：河北省科技计划项目(高淬透性高碳低合金耐磨钢研究:15211031);河北工业职业技术学院应用研发中心项目(低合金耐磨钢淬透性预测和成分设计:2015YF01)

摘　　要：针对新设计的一种高碳低合金耐磨钢65MnCr,利用末端淬火实验测得了淬透性曲线,研究了该钢的淬透性;分析了该钢Φ130 mm柱状工件淬火后从表层到心部的相变组织,并测得了从表层到心部的硬度分布。结果表明：该钢的淬透层的深度为48 mm,相比65Mn钢,淬透性得到了很大提高。Φ130 mm柱状工件的65MnCr钢淬火后半马氏体深度距表面约为40 mm,淬硬层硬度达到60～61 HRC。在30～40 mm深度,主要为马氏体和索氏体的混合组织,硬度下降到54 HRC左右。心部组织为索氏体＋少量贝氏体＋少量的马氏体,硬度大约为48 HRC。For the newly designed high carbon low alloy wear resistant steel 65 MnCr,hardenability curve was determined,its hardenability was studied by the end quenching experiment. The quenched microstructure and hardness distribution of the steel from the surface to the heart of Φ130 mm cylinder workpiece were analyzed. The results show that the depth of the hardened layer of the steel is 48 mm,and hardenability is greatly improved compared with 65 Mn steel. For the quenched cylinder workpiece wih diameter of 130 mm,the depth of half martensite layer is 40 mm. The hardness of the hardened layer is 60-61 HRC. The microstructure of the depth of 30-40 mm is obtained as sorbite and martensite,the hardness of the steel decreases to about 54 HRC. The microstructure of the heart is composed of a small amount of martensite and a small amount of bainite and martensite,and the hardness is about 48 HRC.

关 键 词：淬透性 淬火组织 厚断面工件 低合金耐磨钢 

分 类 号：TG135.6[一般工业技术—材料科学与工程] TG142.72[金属学及工艺—合金]