控冷返红温度对Q460GJE高建钢组织和力学性能的影响  

Effect of Self-Tempering Temperature on Microstructure and Mechanical Properties of a Q460E-Class Steel for High-Rise Building

作　　者：崔占斌 王倩[2] 崔占辉 范磊[2] 王青峰[2] 高聿为[2] 

机构地区：[1]秦皇岛首钢板材有限公司计划部,河北秦皇岛066000 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004 [3]秦皇岛建设局安全监督站,河北秦皇岛066001

出　　处：《钢铁研究学报》2014年第11期64-68,共5页Journal of Iron and Steel Research

基　　金：河北省自然科学基金资助项目(E2013203373)

摘　　要：利用Gleeble热力学模拟机、扫描电镜、透射电镜、着色腐蚀金相等方法研究了控冷返红温度对TMCP交货态低屈强比（不大于0.80）Q460GJE高建钢组织和力学性能的影响。结果表明：随着返红温度的升高,一方面,粒状贝氏体数量减少,针状铁素体数量增加,晶粒显著粗化,屈服强度降低;另一方面,硬相M-A岛的数量增多、尺寸增大,抗拉强度略有上升,屈强比和冲击功（-40℃）降低。拉伸和冲击性能均满足低屈强比Q460GJE钢要求的返红温度范围是590~620℃。The effect of self-tempering temperature on microstructure and mechanical properties of Q460E-class building steel under TMCP delivery was investigated using Gleeble thermo-mechanical simulator,SEM,TEM and coloring metallography.The results indicate that with the self-tempering temperature increasing from 530to650 ℃,the amount of acicular ferrite increases,the amount of granular bainite decreases and grain coarsens,leading to the reduction of the yield strength.On the other hand,the M-A constituents become larger and their amount increases significantly,resulting in the increase of tensile strength and the decrease of both yield ratio and impact toughness（-40 ℃）.The optimum self-tempering temperature satisfying the mechanical property requirements for low yield ratio Q460E-class building steel is 590-620 ℃.

关 键 词：Q460GJE高建钢 中温转变组织 M-A岛 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]