70Si3Mn钢中无碳化物贝氏体组织及其性能研究  

Study on carbide-free bainite microstructure and mechanical properties of 70Si3Mn steel

作　　者：赵佳莉[1] 杨志南[2] 张福成[1,2] 

机构地区：[1]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004 [2]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《燕山大学学报》2015年第3期199-205,212,共8页Journal of Yanshan University

基　　金：国家杰出青年科学基金资助项目(50925522);国家自然科学基金资助项目(51471146)

摘　　要：70Si3Mn钢是传统的弹簧钢，其常规热处理工艺是油淬后中温回火得到屈氏体组织。本文对70Si3Mn钢进行等温淬火处理获得无碳化物贝氏体组织，比较了其经不同温度等温淬火处理后的组织与力学性能，并对其耐磨性进行了研究。结果表明，70Si3Mn钢在Ms以上10-30℃等温可得到无碳化物贝氏体组织，该组织由厚度为160nm的贝氏体铁素体板条和残余奥氏体薄膜组成，它具有较高的强度和硬度、高的塑性和韧性等优异的综合力学性能，同时具有较好的耐磨性。The 70Si3Mn steel is one of the traditional spring steels, to which conventional heat-treatment involves oil quenching and medium-temperature tempering to obtain the troostite mierostructure.In this paper, the 70Si3Mn steel was treated by austempering to obtain the carbide-free bainite microstructure.The microstructures and mechanical properties of the steel were investigated.The re- suits show that the carbide-free bainite microstrueture could be formed in the 70Si3Mn steel by the austempering at a temperature range of Ms ＋ 10 - 30 ℃, which consists of a lath-like bainite ferrite with a average thickness of 160 nm and a film-like retained aus- tenite.Exeellent mechanical properties are exhibited for the steel such as high strength and hardness, high plasticity and toughness as well as good wear resistance.

关 键 词：70Si3Mn钢 无碳化物贝氏体 微观组织 耐磨性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]