淬火温度对Q690D高强钢组织和力学性能的影响  

Effect of quenching temperature on microstructure and mechanical properties of Q690D steel

作　　者：段争涛[1] 李艳梅[1] 朱伏先[1] 张慧云[1] 成康荣 

机构地区：[1]东北大学轧制技术与连轧自动化国家重点实验室,辽宁沈阳110819 [2]南京钢铁联合有限公司,江苏南京210044

出　　处：《金属热处理》2012年第2期81-85,共5页Heat Treatment of Metals

基　　金：中央高校基本科研业务费专项资金(90307004)

摘　　要：研究了一种Q690D高强钢在不同温度淬火后的组织和力学性能。结果表明,淬火温度在890～970℃之间,随着淬火温度的升高,试验钢的强度先增大而后逐渐减小,并在930℃时达到最大;冲击韧性和断后伸长率随淬火温度的升高与强度呈现相反的变化规律。在试验淬火温度区间,试验钢的各项力学性能指标均能满足Q690D钢要求。随着淬火温度的升高,Q690D钢奥氏体平均晶粒尺寸由13.2μm长大到35.3μm,粗大的奥氏体晶粒淬火后得到粗大的板条束组织。The microstructure and mechanical properties of a Q690D high strength steel quenched at different temperatures were investigated.The results show that when the quenching temperature is between 890 ℃ and 970 ℃,with increasing quenching temperature,the strength of the tested steel increases firstly then decreases and the maximum value reaches at 930 ℃,and variation of the impact toughness and elongation are inverse compared with the strength.When the quenching temperature is in the range from 890 ℃ to 970 ℃,the mechanical properties of the tested steel could meet requirement of Q690D steel.The grain size of prior austenite is in range from 13.2 μm to 35.3 μm with increasing quenching temperature.The coarse lath-like microstructure can be obtained from coarse austenite grain after quenching.

关 键 词：Q690D高强钢 淬火温度 组织 力学性能 

分 类 号：TG142.41[一般工业技术—材料科学与工程]