Influence of Different Pre-edge Surfacing Transition Layers on the Structure and Properties of 12Cr2Mo1R/S30408 Joint
LIU Guangyin1, HUANG Jiankang1, YU Xiaoquan1, ZHANG Jianxiao2, FAN Ding1
1 State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 2 Lanzhou Lanshi Heavy Equipment Co., Ltd., Lanzhou 730314, China
Abstract: Aiming at the welding problem of thick plates for low-alloy heat-resistant steel and S30408 austenitic stainless steel, this work proposed a high efficiency and quality welding process, which adopted different transitions layer of E309L, ENiCrFe-3, ENiCrMo-3 with the thickness of 2—3 mm on the side of the heat-resistant steel, then used AA-TIG welding method to weld back side, and used finally submerged arc welding for filling. Metallographic microscope and scanning electron microscope were used to observe interfacial microstructure, and electro probe micro-analysis was performed to analysis alloy elements distribution at the interface. Microhardness and tensile tests were used to test the mechanical properties of the weld joint. The results show that there is a great concentration gradient of Cr, Ni and Fe elements at the interface of 12Cr2Mo1R base metal/transition layer. The ferrite content in the weld of the E309L transition layer is more than ENiCrMo-3 and ENiCrFe-3. The electro probe micro analysis (EPMA) results show that C atom is enriched at the grain boundaries, and the M23C6 carbide-phases is formed in ENiCrMo-3 transition layer. The hardness of interface between base metals and the E309L, ENiCrFe-3 and ENiCrMo-3 transition layer, increases sequentially and gradually decreases toward the center. The tensile strengths of the weld joints of E309L, ENiCrFe-3 and ENiCrMo-3 are 608.1 MPa, 596.2 MPa, 564.5 MPa and the elongation are 21.7%, 21.2%, 18.2%, respectively. All fracture surfaces show the dimple-like morphology.
刘光银, 黄健康, 于晓全, 张建晓, 樊丁. 不同预边堆焊过渡层对12Cr2Mo1R/S30408接头组织与性能的影响[J]. 材料导报, 2022, 36(12): 21050178-5.
LIU Guangyin, HUANG Jiankang, YU Xiaoquan, ZHANG Jianxiao, FAN Ding. Influence of Different Pre-edge Surfacing Transition Layers on the Structure and Properties of 12Cr2Mo1R/S30408 Joint. Materials Reports, 2022, 36(12): 21050178-5.
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2022, Vol. 36 
