摘要
采用Gleeble-3500型热模拟试验机,研究了焊接热循环对Mn-Mo-Nb和高铌HTPX80管线钢焊接热影响区(HAZ)冲击韧性的影响。结果表明,随焊接热输入量的增加,两种X80管线钢粗晶HAZ的冲击韧性均降低,但在相同的焊接热输入条件下,高Nb钢粗晶HAZ的冲击韧性均高于Mn-Mo-Nb管线钢。其原因是高Nb钢中由于未溶Nb(CN)状的存在,抑制奥氏体晶粒长大,在高的线能量条件下,能够保证奥氏体晶粒的细小均匀。
The effects of welding thermal cycle on impact toughness of coarse grain heat affected zone（HAZ）of two kinds X80 pipeline steels,namely Mn-Mo-Nb steel and high-Nb HTP pipeline steels,were investigated by means of welding thermal simulation on Gleeble-3500 simulator.The results show that the impact toughness of HAZ of two kind pipeline steels decreases with welding line energy increase.While at same welding line energy,the impact toughness of HAZ of high-Nb steel is higher than that of Mn-Mo-Nb steel.The reason is that some undissolved Nb（ CN ）particles in high-Nb restrain the austenite grain growth ,which ensures that the small and uniform austenite grain size can be obtained at higher welding line energy.
出处
《金属热处理》
CAS
CSCD
北大核心
2009年第12期32-35,共4页
Heat Treatment of Metals
基金
河北省科技支撑计划项目(09276705D)
河北省自然科学基金(E2009000443)
国家教育部博士点专项基金(20070216008)
关键词
管线钢
焊接热影响区
冲击韧性
pipeline steel
heat affected zone（HAZ）
impact toughness
