10CrNiCu钢激光-MAG复合焊热循环及组织特性研究

采用热电偶测温技术测量了激光-MAG复合焊及常规MAG焊接头粗晶区热循环曲线,并通过金相显微镜对比分析了两种焊接接头粗晶区组织特征。研究结果表明:与常规MAG焊相比,HLAW热循环加热及冷却速度较大,高温停留时间短,呈陡升陡降特征;粗晶区主要由粒状贝氏体、贝氏体、贝氏体基体上析出粒状碳化物组织及细小板条状马氏体组成;M-A岛含量较少,以细小颗粒状弥散分布在铁素体基体上。

Study on Thermal Cycle and Microstructure Characteristics of 10CrNiCu Steel by Hybrid Laser-MAG Welding

Thermocouple was adopted to obtain welding thermal cycle in 10CrNiCu steel by hybrid laser-MAG welding and traditional MAG welding processes. The microstructure and M-A constituents were also analyzed by optical microscopy. The experiment result shows that,compared to traditional MAG welding processes,the residence time upon 1 100 ℃ of HLAW was relatively smaller,the heating rate and cooling rate of thermal curve were greater,and the pattern of the welding thermal cycle was rapid ascending and descending; the HAZ consists of granular bainite,bainite,granular structure and M-A constituents; and the number of dispersively distributed fine M-A constituent decreased in HLAW。