异种高强钢气保焊焊接接头的氢脆敏感性

发布时间：2018-05-06 10:35

本文选题：异种高强钢 + 焊接接头　；参考：《金属热处理》2017年07期

【摘要】：利用氢渗透试验、电化学测试、慢应变拉伸试验(SSRT)研究了异种高强钢气保焊焊接接头在海水中的氢渗透行为及应力腐蚀敏感性,并结合扫描电镜对断口形貌进行了观察。结果表明:异种钢焊接接头各区域的耐蚀性能和氢渗透特性存在明显差别,A侧热影响区的耐蚀性能最差并有明显的析氢倾向;充氢后焊接接头的腐蚀倾向和析氢倾向加剧,自腐蚀电位发生负移,析氢电位正移;不同阴极极化电位拉伸下,异种钢焊接接头的抗拉强度和规定塑性延伸强度都分别在830 MPa和760 MPa左右,介于基体A和基体B之间,断裂位置均在A侧热影响区,表明A侧热影响区是焊接接头产生氢脆断裂的危险区域,当阴极极化电位负于-950 mV时,焊接接头出现明显的氢脆特征。
[Abstract]:Hydrogen permeation behavior and stress corrosion susceptibility of gas shielded welded joints of dissimilar high strength steel in seawater were studied by hydrogen permeation test, electrochemical test and slow strain tensile test (SSRT). The fracture morphology was observed by scanning electron microscope (SEM). The results show that the corrosion resistance and hydrogen permeation of dissimilar steel welded joints are obviously different, and the corrosion resistance and hydrogen evolution tendency of the heat affected zone of A side are the worst, and the corrosion tendency and hydrogen evolution tendency of the welded joints after hydrogen filling are increased. Under different cathodic polarization potential, tensile strength and specified plastic extension strength of welded joints of dissimilar steels were about 830 MPa and 760 MPa, respectively, between matrix A and matrix B. The location of fracture is in the heat affected zone of side A, which indicates that the heat affected zone of side A is the dangerous zone of hydrogen embrittlement fracture of welded joint. When the cathode polarization potential is negative at -950 MV, the welded joint appears obvious hydrogen embrittlement characteristic.
【作者单位】：青岛科技大学机电工程学院;中国船舶重工集团公司第七二五研究所海洋腐蚀与防护重点实验室;
【分类号】：TG407

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