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论文类型：期刊论文

发表时间：2018-07-01

发表刊物：JOURNAL OF MATERIALS PROCESSING TECHNOLOGY

收录刊物：SCIE、EI

卷号：257

页面范围：88-100

ISSN号：0924-0136

关键字：Titanium alloy; Stainless steel; GTAW; Intermetallic compound; Microstructure; Mechanical property

摘要：TiFe and TiFe2 intermetallic compounds (IMCs) were effectively suppressed with copper -based filler wire when joining TC4 titanium alloy to 304 stainless steel by gas tungsten arc welding (GTAW). A Ti/Cu reaction zone, consisting of various IMCs like Ti2Cu, A1Cu(2)Ti, TiCu, Ti3Cu4 phases, formed between TC4 substrate and the weld. Increasing welding heat input induced the formation of TiFe, TiFe2 and complex Ti Cu Al Fe IMCs in the Ti/Cu reaction zone. The highest shear fracture load occurred at welding heat input of 2.34 kJ/cm reached 341 N/mm corresponding to 107 MPa in shear strength, and the microhardness in the Ti/Cu reaction zone was about 619 HV. Further increasing welding heat input deteriorated the shear fracture load and increased the micro hardness in the Ti/Cu reaction zone. All joints fractured at the Ti/Cu reaction zone with cleavage characteristics on the fracture surface due to the brittle IMCs and micro cracks generated in the Ti/Cu reaction zone.