摘要
为开发出屈服强度1 100 MPa级的超高强度工程机械用钢,研究了淬火制度对试验钢显微组织和力学性能的影响。结果表明,试验钢的淬火态组织为高位错密度的板条马氏体,板条内分布着长度为100 nm左右的ε-碳化物;淬火温度和保温时间对原始奥氏体晶粒尺寸有明显的影响,从而影响试验钢的力学性能。当淬火温度由840℃升高到900℃时,试验钢的平均奥氏体晶粒尺寸由9μm增加到12. 5μm,屈服强度逐渐下降,低温冲击韧性先增加后降低;当淬火温度为840～860℃、保温时间为10～15 min时,试验钢具有最优的强韧性。
To develop the Q1100 ultra-high strength engineering machinery steel,the effects of quenching temperature and holding time on the microstructure and mechanical properties of the test steel were investigated.The results indicated that the as-quenched microstructure of the test steel was lath martensite with high dislocation density andε-carbides of about 100 nm length dispersed in it.The quenching temperature and holding time had a significant influence on the size of prior austenite grain,and there by on the mechanical properties of the test steel.When the quenching temperature increased from 840℃to 900℃,the average austenite grain size increased correspondingly from 9μm to 12.5μm,and the yield strength gradually decreased,and the low temperature impact toughness increased first and then decreased.When the quenching temperature was in the range of 840℃to 860℃,and the holding time was between 10 min and 15 min,the test steel exhibited the best combination of strength and toughness.
作者
闫强军
温长飞
姜在伟
张仪杰
邓想涛
Yan Qiangjun;Wen Changfei;Jiang Zaiwei;Zhang Yijie;Deng Xiangtao(Plate Plant of Nanjing Iron and Steel Co.,Ltd.,Nanjing Jiangsu 210035,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang Liaoning 110819,China)
出处
《上海金属》
CAS
北大核心
2018年第6期39-44,共6页
Shanghai Metals
基金
国家自然科学基金(No.51504064)
关键词
超高强结构钢
淬火工艺
显微组织
奥氏体晶粒
力学性能
ultra-high strength structural steel
quenching process
microstructure
austenite grain
mechanical property
