摘要
采用热模拟技术研究了X80管线钢在不同焊接热循环条件下晶粒及第二相粒子的变化。结果表明:焊接粗晶区奥氏体晶粒尺寸分布均匀,平均为30～40μm,且当第二相粒子尺寸小、数量多时由于其对原始奥氏体晶界钉扎力大,所得晶粒尺寸较小。并以试验数据为基础,通过引入晶粒长大阈值,考虑了第二相粒子对奥氏体晶界钉扎作用的影响,建立了X80管线钢焊接粗晶区奥氏体晶粒长大的动力学方程。
Thermal simulating technology was adopted to study grain size and the precipitates distribution of CGHAZ for X80 pipeline steel with different welding condition. The expermiental results showed that the austensite grain with mean size of about 30-40μm has uniform size distribution. In addition, the grain was fine when the precipitates have small size and large quantity. Considering the pinning effect of the precipitates, the grain growth kinetic model of CGHAZ for X80 pipeline steel was established based on experimental data through introducing the limiting grain size.
出处
《机械工程材料》
CAS
CSCD
北大核心
2006年第11期69-72,共4页
Materials For Mechanical Engineering
关键词
X80管线钢
粗晶区
第二相粒子
动力学方程
X80 pipeline steel
coarse grain heat-affected zone
precipitates
kinetic model
