摘要
采用力学性能测试、金相分析及TEM微观结构分析,研究了淬火温度及保温时间对低合金耐磨钢显微组织和力学性能的影响,并通过端淬试验研究了奥氏体化温度对淬透性的影响.结果表明:在830～910℃温度范围内,淬透性随奥氏体化温度升高而提高,当奥氏体化温度超过910℃时,钢板淬透性降低.850℃保温30～45 min的亚温淬火组织中,存在尺寸为1μm左右的高缺陷铁素体弥散分布,使钢板韧性得到提高;910℃保温45～60 min完全淬火后,钢板具有良好的强韧性;奥氏体温度超过930℃以及延长保温时间都会使原始奥氏体晶粒粗化,导致钢板韧性降低.
The effects of austenitizing temperature and holding time on microstructure and mechanical properties of high strength low alloy wear resistant steel were investigated by means of optical micrograph,TEM and mechanical property tests.Jominy test was conducted and the influence of austenitizing temperature on the hardenability of the quenching steel was studied.The results showed that the hardenability of the quenched steel increases with the increase of the austenitizing temperature at 830~910 ℃,moreover it will decrease when the temperature is higher than 910 ℃.The steel toughness is improved by dispersive distribution of ferrite about 1 μm with high density defect after austenitizing at 830 ℃ for 30~45 min.The quenched steel has high hardness and good toughness after austenitizing at 910 ℃ for 45~60 min.The toughness decreases by the coarsening of original austenite grain after austenitizing at a temperature higher than 930 ℃ or even at 930 ℃,if the temperature holding time is longer than 45 min.
出处
《材料与冶金学报》
CAS
北大核心
2013年第1期62-66,共5页
Journal of Materials and Metallurgy
基金
国家重点研究发展计划(973)项目(2010CB630800)
关键词
奥氏体化温度
耐磨钢
显微组织
力学性能
淬透性
austenitizing temperature
wear resistant steel
microstructure
mechanical property
hardenability
