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采用309焊丝对中国低活化马氏体(CLAM)钢和316L不锈钢进行TIG焊,并利用光学显微镜、扫描电镜和维氏硬度仪分析对接接头的微观组织和显微硬度分布。结果表明,CLAM-316L TIG焊接头按照显微组织特征可分为六个区域,即CLAM钢母材、CLAM钢热影响区、CLAM钢熔合区、焊缝金属、316L热影响区、316L母材。CLAM钢熔合区显微组织为淬火马氏体;焊缝金属区为粗大的胞状枝晶组织;316L热影响区和母材均为奥氏体组织,热影响区晶粒尺寸有明显长大。焊态接头整体硬度分布均匀,只有CLAM钢熔合区硬度较高。
The 309 welding wire was used for TIG welding of China low activated martensite (CLAM) steel and 316L stainless steel. The microstructure and microhardness distribution of the butt joints were analyzed by optical microscope, scanning electron microscopy and Vickers hardness tester. The results show that the CLAM-316L TIG welded joints can be divided into six regions according to their microstructures: CLAM steel base material, CLAM heat affected zone, CLAM steel fusion zone, weld metal, 316L heat-affected zone, 316L base metal . The microstructure of CLAM steel fusion zone is quenched martensite; the weld metal zone is coarse dendritic dendrites; the 316L HAZ and the base metal are both austenitic and the grain size in HAZ obviously grows. The overall hardness distribution of welded joints uniform, only CLAM steel fusion zone hardness higher.