CAJ | 학술논문

以核电站安全壳用42.5 mm厚SA738Gr.B钢板为试验材料，研究了熔化极气体保护焊焊接过程中的热输入以及焊后热处理对试验钢焊接接头组织和性能的影响。结果表明，随着焊接热输入量的增加，焊接接头的低温冲击功有先增大后减小的趋势；抗拉强度相差不大；而焊后热处理对焊接接头的力学性能影响较小。随着线能量的增大，针状铁素体减小且伴随着一定程度的粗化，粗大的先共析铁素体组织明显增多。焊接热输入量在1.2～2.0 kJ/mm范围内焊接时，焊接接头均可获得良好的综合力学性能。焊后消除应力热处理对焊接接头的性能影响不大，当采用较大线能量进行焊接时，建议进行焊后热处理以减小残余拉应力。
이핵전참안전각용42.5 mm후SA738Gr.B강판위시험재료，연구료용화겁기체보호한한접과정중적열수입이급한후열처리대시험강한접접두조직화성능적영향。결과표명，수착한접열수입량적증가，한접접두적저온충격공유선증대후감소적추세；항랍강도상차불대；이한후열처리대한접접두적역학성능영향교소。수착선능량적증대，침상철소체감소차반수착일정정도적조화，조대적선공석철소체조직명현증다。한접열수입량재1.2～2.0 kJ/mm범위내한접시，한접접두균가획득량호적종합역학성능。한후소제응력열처리대한접접두적성능영향불대，당채용교대선능량진행한접시，건의진행한후열처리이감소잔여랍응력。
The SA738Gr.B steel plate with 42.5 mm thickness for the safety shell of a nuclear power plant is used as the experimental material, the GMAW welding heat input and post weld heat treatment on the microstructure and properties of welded joint were studied. The results show that, with increasing of the welding heat input, low temperature impact toughness of welded joint increased firstly and then decreased;the tensile strength difference is lesser, and the post weld heat treatment has little effect on the mechanical properties of the welding joint. Weld microstructure has fine and homogeneous acicular ferrite, with increasing of input energy lines, acicular ferrite prime number gradually decreased and accompanied by a certain coarsening, massive pro-eutectoid ferrite increased significantly. Welding heat input in the range of 1.2-2 kJ/mm in the range of welding, the better comprehensive mechanical properties can be obtain in welding joint, on this condition post weld stress relief heat treatment has little effect on the properties of welded joints. When using large line energy welding, heat treatment after welding is recommended to reduce the residual tensile stress.