摘要
以Q890D钢为研究对象,采用OM、SEM及TEM等分析手段研究了不同淬火温度(850~950℃)下实验钢的组织与力学性能的对应关系。结果表明:随着淬火温度的升高,显微组织中马氏体板条逐渐增大,微合金元素的碳氮化物弥散分布于马氏体板条内与板条间;微合金元素的碳氮化物溶解后钉扎晶界作用减弱使得原奥晶粒尺寸由8.2μm增加到15.38μm。屈服强度和抗拉强度随淬火温度的升高呈现先升高后降低的变化趋势,冲击韧性整体呈降低趋势,但900℃时出现增加态势,之后逐渐降低。综合显微组织与力学性能分析结果,认为Q890D钢最佳淬火温度为900℃。
The relationship between microstructure and mechanical properties of Q890D steel at different quenching temperature(850~950℃)was studied by OM,SEM and TEM.The results show that the martensite lath in the microstructure increases gradually with the increasing of quenching temperature,and the carbonitrides of micro-alloyed elements disperse in and between the martensite laths;the pinning effect weakens after the carbonitrides of micro-alloyed elements dissolve,and the grain size of original austenite increases from 8.2μm to 15.38μm.With the increasing of quenching temperature,the yield strength and tensile strength first increase and then decrease,and the impact toughness decreases as a whole,but increases at 900℃then decreases gradually.Based on the analysis of microstructure and mechanical properties,the best quenching temperature of Q890D steel is 900℃.
作者
孙志溪
卢锐
高野
李志峰
陈俊
刘振宇
Sun Zhixi;Lu Rui;Gao Ye;Li Zhifeng;Chen Jun;Liu Zhenyu(Production and Manufacturing Department of HBIS Group Hansteel Company, Handan, Hebei, 056015;State Key Laboratory of Rolling Technology and Continuous Rolling Automation, Northeastern University, Shenyang, Liaoning, 110819)
出处
《河北冶金》
2021年第3期28-33,共6页
Hebei Metallurgy
关键词
Q890D
淬火温度
显微组织
奥氏体晶粒
力学性能
Q890D
quenching temperature
microstructure
austenite grain
mechanical properties
