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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。
Hydrogen permeation test, electrochemical test and slow strain tensile test (SSRT) were used to study the hydrogen permeation and stress corrosion susceptibility of seawater welded joints with different kinds of high strength steel. SEM and SEM were used to analyze the fracture morphology Observed. The results show that there are obvious differences between the corrosion resistance and the hydrogen permeation characteristics of the dissimilar steel welded joints, and the corrosion resistance of the heat affected zone on the A side is the worst with obvious hydrogen evolution tendency. The corrosion tendency and hydrogen evolution tendency And the potential of hydrogen evolution is positive. Under the different cathodic polarization potentials, the tensile strength and the specified plastic extension strength of dissimilar steel welded joint are about 830 MPa and 760 MPa, respectively, between the substrate A And the substrate B, the fracture locations are in the heat-affected zone on the A side, indicating that the heat affected zone on the A side is a danger zone of hydrogen embrittlement fracture of the welded joint. When the cathodic polarization potential is negative -950 mV, Hydrogen embrittlement features.