Microstructures and Mechanical Properties of Welded Joints Made of 603 High Strength Steel and High Nitrogen AusteniticStainless Steel

doi:10.12382/bgxb.2021.0490

Abstract

Abstract: Due to superior mechanical properties, high nitrogen austenitic stainless steel and 603 martensitic high strength steel are ideal materials for armor protection. According to the principle of “low strength matching”, ER307Mo austenitic stainless steel wire is selected for welding 30mm thick high nitrogen austenitic stainless steel and 603 martensitic high strength steel by pulse MIG butt welding. The microstructures and mechanical properties of the welded joints are analyzed. The results show that the welded joints with good surface appearance and no internal cracks and fusion defects are obtained. The microstructure is primarily austenite and ferrite dendrite surrounded by austenite matrix. The microstructure near the fusion line of high nitrogen austenite stainless steel is mainly austenite, and the microstructure near the fusion line of 603 steel is mainly strip martensite, bainite and tempered martensite. The joint's fracture is mainly ductile fracture, with a small percentage of cleavage fracture. EDS point scanning results show that the second phase particles at the center of the dimple are Fe rich carbides. The average tensile strength of the welded joints is 722 MPa and the average elongation after fracture is 20.2%. The dynamic yield strength of the welding metal is 913 MPa, the maximum engineering stress is 2 045 MPa, and the impact resistance exceeds that of the 603 steel base metal.

Key words: highnitrogenausteniticstainlesssteel, 603martensitichighstrengthsteel, ER307Mowire, microstructure, mechanicalproperties

CLC Number:

TG47

YANG Dongqing, ZHANG Jian, FAN Jikang, ZHOU Zhao, WANG Kehong. Microstructures and Mechanical Properties of Welded Joints Made of 603 High Strength Steel and High Nitrogen AusteniticStainless Steel[J]. Acta Armamentarii, 2022, 43(8): 1990-1997.

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