ZG75Si2Mn1CrB钢的等温淬火工艺  

Austempering process of ZG75Si2Mn1CrB steel

作　　者：艾地[1] 刘耀东[1] 刘晓春[2] 刘云旭[1] 

机构地区：[1]长春工业大学先进结构材料省部共建教育部重点实验室,吉林长春130012 [2]吉林大学超塑性与塑性研究所,吉林长春130022

出　　处：《金属热处理》2013年第4期57-59,共3页Heat Treatment of Metals

基　　金：国家自然科学基金(51171030)

摘　　要：利用光学显微镜、洛氏硬度计和摆锤式冲击试验机对新型的高碳低合金钢ZG75Si2Mn1CrB进行了低温条件下等温淬火工艺和组织力学性能的研究。结果表明,ZG75Si2Mn1CrB钢经200℃等温淬火,能够获得贝氏体铁素体与奥氏体、马氏体和残留奥氏体的混合组织。该钢种理想的等温淬火工艺为920℃奥氏体化,200℃等温22 h,其硬度为49.16 HRC,冲击吸收能量为28 J。低温等温淬火不但使组织细化,且能提高耐磨性降低生产成本。综合力学性能也有改善。The anstempering process at low temperatures, microstructure and mechanical properties of a new high carbon low alloy steel ZG75Si2MnlCrB were researched by means of optical microscopy, Rockwell hardness tester and pendulum impact testing machine. The results show that the mixed structure of bainite-ferrite with austenite, martensite and retained austenite of the steel can be obtained by austempering at 200 ℃. The ideal austempering process of the steel is austenitization at 920 ℃ and then austempering at 200 ℃ holding for 22 h, its hardness is 49. 16 HRC and the impact absorbing energy is 28 J. The austempering at low temperatures makes not only the microstructure is fined and the wear resistance is improved but also the production cost reduces, and the comprehensive mechanical properties are also improved.

关 键 词：高碳低合金钢 超级贝氏体 等温淬火 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]