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TA2/ Co13Cr28Cu31Ni28/ Q235脉冲TIG焊接头组织与性能
引用本文:裴龙基,胡志月,瞿龙,蒋淑英,张军利.TA2/ Co13Cr28Cu31Ni28/ Q235脉冲TIG焊接头组织与性能[J].焊接学报,2021,42(11):90-96.
作者姓名:裴龙基  胡志月  瞿龙  蒋淑英  张军利
作者单位:中国石油大学(华东), 青岛, 266580
基金项目:山东省自然科学基金面上项目(ZR2020ME013)
摘    要:针对钢与钛之间因物化性能差异大,焊接过程易产生大量金属间化合物而难以实现可靠连接的问题,依据焊缝金属固溶高熵化思路,选用Co13Cr28Cu31Ni28高熵合金作为中间过渡层对TA2钛和Q235钢进行脉冲钨极氩弧焊,并对Co13Cr28Cu31Ni28高熵合金及接头的组织和性能进行分析研究. 结果表明,Co13Cr28Cu31Ni28主要是双相面心立方结构,分别为富Cu的晶间和晶内面心立方结构,强度和塑性良好;焊接接头两部分焊缝均成形良好,无气孔、裂纹等缺陷,焊缝组织均为简单的固溶体结构,Q235侧焊缝主要为面心立方结构相,TA2侧焊缝主要由简单的体心立方结构和面心立方结构相构成,以体心立方结构相为主;焊接接头抗拉强度为224 MPa,在TA2侧靠近高熵合金的熔合线处断裂,主要由于生成了脆性的Cr3O8,断口有较多韧窝和一部分解理面,为混合断裂,表现出一定的韧性断裂特征.

关 键 词:TA2钛    Q235钢    高熵合金    脉冲TIG焊    组织和性能
收稿时间:2021-04-27

Microstructure and properties of TA2/ Co13Cr28Cu31Ni28/ Q235 pulsed TIG weld joint
Affiliation:China University of Petroleum (East China), Qingdao, 266580,China
Abstract:Due to the significant difference in physical and chemical properties between steel and titanium, a large number of intermetallic compounds are formed in the weld, which makes it difficult to achieve reliable connections. According to the idea of solid dissolution and high entropy of weld metal, Co13Cr28Cu31Ni28 high entropy alloy was selected as an intermediate transition layer for pulse tungsten inert gas welding of TA2 titanium and Q235 steel, the microstructure and properties of Co13Cr28Cu31Ni28 high entropy alloy and the weld joint were analyzed and studied. The results show that Co13Cr28Cu31Ni28 mainly has a two-phase face-centered cubic structure (FCC),which is cu-rich intercrystalline FCC phase and intra crystalline FCC phase, and its strength and plasticity are good. The welded joint is formed well, without stomals, cracks and other defects. The weld microstructure is composed of simple solid solution structures, which are mainly FCC phases on the Q235 side, and mainly body-centered cubic structure (BCC) and FCC phases on the TA2 side, mainly composed of BCC phases. The tensile strength of the welded joint is 224 MPa, broken at the fusion zone near the high entropy alloy on the TA2 side, this is mainly due to the formation of brittle Cr3O8. Many dimples and cleavage planes are observed on the fracture port, which shows certain tough fracture characteristics.
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