The analysis show that the main reason to easy erode austenitegrainboundary after tempering is the precipitation situation of carbide.
分析可知，碳化物的析出情况是回火后易侵蚀出奥氏体晶界的主要原因。
2
This paper shows that inheritance phenomenon of coarse austenite grains are due to the boundary segregation of carbide along the prior austenitegrainboundary.
研究表明，调质后粗晶奥氏体的遗传现象，是由于沿原奥氏体晶界碳化物偏聚析出的结果。
3
The main reason for cracking is liquid copper diffused into the austenitegrainboundary and grain boundary embrittlement was caused, so the welded pipe cracked under stress.