焊后热处理对装甲钢HAZ/WM界面区组织结构的影响  

Influence of PWHT on HAZ/WM Interfacial Microstructure in High-Strength Armored Steel Weldments

作　　者：谭伟[1] 郭松涛[1] 宋明福[1] 贺军辉[1] 韩文政[1] 

机构地区：[1]装甲兵工程学院装备再制造工程系,北京100072

出　　处：《装甲兵工程学院学报》2007年第5期37-40,共4页Journal of Academy of Armored Force Engineering

基　　金：国家自然科学基金项目(50574097)

摘　　要：采用SEM、TEM观察焊态和焊后热处理（900℃×5min或1100℃×1min，水淬）TWE312／616装甲钢HAZ／WM界面区及其附近的组织结构，采用Nano Test600对界面区附近的硬度分布进行测试。研究表明：焊接熔合区组织为类马氏体，而富奥氏体带以奥氏体为主；HAZ／WM界面区的塑性变形主要由富奥氏体带承担，富奥氏体带的加工硬化导致该处硬度升高；高温短时（1100℃×1min，水淬）热处理可导致焊接熔合区及与其紧邻的t—HAZ的进一步软化。HAZ/WM interfacial microstructure is observed either in as-welded or as-quenched （PWHT： 900℃× 5 rain or 1 100℃×1 min, Water-quenched）TWE312/616 high-strength armored steel weldments by means of SEM or TEM respectively. It is discovered that the microstructure in weld bond was composed of martensite-like layer and that in austenite-rich zone it is occupied mainly by austenite. The nano-hardness distribution across the traverse as-welded TWE312 /516 armored steel weldment is investigated by means of Nano Test 600 machine. Maximum nano-hardness readings are observed in austenite-rich zone and this is attributed to the working hardening effects of the plastic-deformed austenite. However, the nano-hardness level both in weld bond and true HAZ just next to the weld bond are less than those in austenite-rich zone. Furthermore, post weld heat treatment, heated up to 1 100 ℃ for 1 min and then water-quenched, would decrease the nano-hardness level both in weld bond and in true HAZ.

关 键 词：焊接界面 熔合区 富奥氏体带 组织 焊后热处理 装甲钢 

分 类 号：TM271[一般工业技术—材料科学与工程]