摘要
采用热模拟技术、显微组织分析技术及冲击试验，对07MnCrMoVR钢热影响区的组织及冲击韧性进行了深入研究。结果表明，单次热循环时，粗晶区和临界区是冲击韧性较差的区域，粗晶区冲击韧性恶化的原因是晶粒的长大和粒状贝氏体及M-A组元等非平衡组织的形成，且随着t。硝的增加，粗晶区冲击韧性随之降低。为防止热影响区脆化，t8/5应控制在30S内。粗晶区＋临界区是热影响区冲击韧性最差的区域，大量沿晶界分布的块状M—A组元的形成是导致此区域脆化的原因。
The mechanical properties and microstructure of 07MnCrMoVR heat affected zone was studied by thermal simulation technology and microstructure examination technology. The results indicated that coarse grain zone and critical zone are the brittlement zones during single thermal cycle testing, and the grain coarsening and the formation of non-equilibrium granular bainite and M-A constituent resulted in the brittlement of coarse grain zone. With the increase of ts/5 , the toughness of coarse grain zone decrease, and it should be controlled in 30 s in actual welding. IRCGHAZ is the weakest zone in the HAZ during the second thermal cycling, and the formation of lot of massive M-A constituents distributed along grain boundary is the main cause for the brittlement of intercritically reheated coarse grained HAZ.
出处
《首钢科技》
2010年第6期16-22,共7页
Shougang Science and Technology
