摘要
采用热模拟试验技术,研究了X100管线钢焊接热影响区的组织与性能变化规律,结果表明:采用高Nb、微Ti设计的低碳X100管线钢的焊接粗晶区经焊接热循环后仍保持良好的韧性。焊接热影响区的脆化区出现在峰值温度为750℃的两相区。沿原奥氏体晶界形成的岛状组织是导致韧性降低的主要原因。
The microstructures and mechanical properties of the welding heat affected zone （HAZ） of X100 pipeline steels are studied by means of a thermal simulation technique. The results show that the coarse grain HAZs of the X100 pipeline steels with high-Nb and low Ti have higher toughness after welding thermal cycles. The embrittlement region appeared in two-phase field in HAZ when the peak temperature is 750 ℃. The island-like structure distributed along proceding austenite grain boundary mainly explain the decrease of toughness.
出处
《燕山大学学报》
CAS
2011年第6期528-532,共5页
Journal of Yanshan University
基金
河北省自然科学基金资助项目(E2011203169)
