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。
T73 and RRA treatment improve the grain boundary character, which is help to inhibit hydrogen embrittlement and decrease anodic dissolution rate, then to improve the SCCR of the alloy.
T73和RRA时效处理改善了合金晶界特性，有助于阻止氢脆、减缓晶界阳极溶解速度，提高合金的抗应力腐蚀能力。
The authors suggest that the primary factors of the reheat embrittlement are precipitation of coarse carbide along the grain boundary and secondary hardening in the grain.
出现再热脆性的主要原因是晶界粗大碳化物的析出和晶内二次硬化。
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