【摘要】：采用慢應(yīng)變速率拉伸(SSRT)和高溫電化學(xué)相結(jié)合的方法,研究了外加電位對(duì)321-52M-690異種金屬焊接接頭在含Cl-高溫高壓水中應(yīng)力腐蝕開裂(SCC)傾向的影響規(guī)律。結(jié)果表明,在300℃、50ppm Cl-環(huán)境下,焊接接頭的SCC敏感性隨電極電位(-700~+100mV)的升高而增大,且存在一個(gè)介于0~+50mV(vs.SHE)之間的臨界電位Ecrit。當(dāng)電極電位低于Ecrit時(shí),焊接接頭的SCC敏感性較小,SCC敏感性指數(shù)ISSRT基本在40%左右,斷裂形式為外力主導(dǎo)的塑性開裂;當(dāng)電極電位高于Ecrit時(shí),ISSRT急劇增加至70%以上,斷裂形式為腐蝕主導(dǎo)的脆性開裂。試樣斷裂位置均位于硬度最低的321母材處,表明在321/690異種金屬焊接接頭中321母材對(duì)SCC最為敏感,故進(jìn)一步探討了321不銹鋼的應(yīng)力腐蝕開裂行為和機(jī)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，

本文編號(hào)：2235056