321-52M-690异种金属焊接接头的应力腐蚀开裂行为研究
发布时间：2018-09-10 16:57
【摘要】：采用慢应变速率拉伸(SSRT)和高温电化学相结合的方法,研究了外加电位对321-52M-690异种金属焊接接头在含Cl-高温高压水中应力腐蚀开裂(SCC)倾向的影响规律。结果表明,在300℃、50ppm Cl-环境下,焊接接头的SCC敏感性随电极电位(-700~+100mV)的升高而增大,且存在一个介于0~+50mV(vs.SHE)之间的临界电位Ecrit。当电极电位低于Ecrit时,焊接接头的SCC敏感性较小,SCC敏感性指数ISSRT基本在40%左右,断裂形式为外力主导的塑性开裂;当电极电位高于Ecrit时,ISSRT急剧增加至70%以上,断裂形式为腐蚀主导的脆性开裂。试样断裂位置均位于硬度最低的321母材处,表明在321/690异种金属焊接接头中321母材对SCC最为敏感,故进一步探讨了321不锈钢的应力腐蚀开裂行为和机理。
[Abstract]:The effect of applied potential on the stress corrosion cracking (SCC) tendency of 321-52M-690 dissimilar metal welded joints in high temperature and high pressure water containing Cl- was studied by means of slow strain rate tensile (SSRT) and high temperature electrochemical method. The results show that the SCC sensitivity of welded joints increases with the increase of electrode potential (-700 ~ 100mV) at 300 鈩，
本文编号：2235056
[Abstract]:The effect of applied potential on the stress corrosion cracking (SCC) tendency of 321-52M-690 dissimilar metal welded joints in high temperature and high pressure water containing Cl- was studied by means of slow strain rate tensile (SSRT) and high temperature electrochemical method. The results show that the SCC sensitivity of welded joints increases with the increase of electrode potential (-700 ~ 100mV) at 300 鈩，
本文编号：2235056
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