In the first cracking stage grain boundary released more hydrogen than in the second stage.
而微空洞释氢则第二阶段多于第一阶段。
The main reason for cracking is liquid copper diffused into the austenite grain boundary and grain boundary embrittlement was caused, so the welded pipe cracked under stress.
开裂主要原因为液相铜扩散进入奥氏体晶界引起晶界脆化，在应力作用下引起焊管开裂。
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