热变形和冷却对700 MPa级Mo-Nb微合金化钢组织的影响  

Effect of Hot Deformation and Cooling on Structure of 700 MPa Mo-Nb Microalloy Steel

作　　者：王佳夫[1] 林清华[1] 漆世泽[1] 杜林秀[1] 刘相华[1] 王国栋[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110004

出　　处：《特殊钢》2003年第5期13-15,共3页Special Steel

基　　金：国家重点基础研究发展规划"973"G1 9980 61 5 0 9;国家高技术产业化"863"2 0 0 1AA332 0 2 0资助项目

摘　　要：通过Gleeble 15 0 0热模拟试验机和光学显微镜 ,研究了变形及冷却对 70 0MPa级 0 .0 4C 0 .2 7Mo 0 .0 4 7Nb微合金化钢组织和硬度的影响。得出该钢的静态 (不变形 )和动态 (变形 )奥氏体连续冷却转变 (CCT)曲线 ,高温转变区 ,相变产物为先共析铁素体和粒状贝氏体 ;中温转变区 ,相变产物主要为贝氏体。热变形促进了铁素体和贝氏体相变 ,扩大了形成铁素体的冷却速度范围 ,推迟了羽毛状贝氏体的形成。The hot deformation and cooling on structure and hardness of 700 MPa 0.04C-0.27Mo-0.047Nb microalloy steel have been investigated by Gleebe 1500 hot simulator and optical microscope. The static (undeformed) and dynamic (deformed) austenite continuous cooling transformation (CCT) curves were got, by which in high temperature transformation area the products were proeutectoid ferrite and granular bainite and in medium temperature transformation area the products mainly were bainite. The test results showed that hot deformation promoted ferrite and bainite transformation, enlarged cooling speed range to form ferrite and inhibited feathery bainite transformation.

关 键 词：微合金化钢 组织 硬度 热变形 冷却速度 热模拟试验机 光学显微镜 

分 类 号：TG142.1[一般工业技术—材料科学与工程]