高Ti低合金钢中TiC粒子的固溶及沉淀析出行为  

Solution and precipitating behaviors of TiC particles in high Ti low alloy steel

作　　者：刘罗锦 梁小凯[1] 孙新军[1] Liu Luojin;Liang Xiaokai;Sun Xinjun(Institute of Engineering Steel,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院工程用钢所,北京100081

出　　处：《金属热处理》2020年第4期110-114,共5页Heat Treatment of Metals

摘　　要：通过高温激光扫描共聚焦显微镜(Laser scanning confocal microscopy,LSCM)观察高Ti(0. 6wt%Ti)低合金钢升温和降温过程中TiC粒子的演变规律,结合Thermo-Calc软件计算并借助OM、SEM、TEM等分析方法对试验钢中TiC粒子形貌和分布进行表征,研究TiC粒子的析出规律。试验结果表明:不同温度阶段生成的TiC粒子形态各异,按照粒径由大到小顺序逐渐从基体中析出,高温对小尺寸TiC粒子析出的抑制作用更为显著。高温下多个尺寸较大的相邻TiC粒子会在试样表面发生聚集形成絮状形貌,高温固相析出的TiC粒子由球体不稳定状态向立方体稳定形貌转变,粗化程度可忽略。Evolution of Ti C particles during heating and cooling of high Ti( 0. 6 wt% Ti) low alloy steel was observed by means of high temperature laser scanning confocal microscopy( LSCM). The morphology and distribution of Ti C particles in the steel were analyzed by means of OM,SEM,EDS,etc and combined with Thermo-Calc software calculation. The precipitating behaviors of Ti C particles were studied. The test results show that the Ti C particles formed in different temperature stages have different shapes,and gradually precipitate from the matrix according to the particle diameter order from large to small. The inhibition of precipitation of small-sized Ti C particles by high temperature is more remarkable. At high temperature,a plurality of adjacent large-sized Ti C particles aggregate on the surface to form a flocculent morphology. And Ti C particles precipitated at high temperature solid phase change from a spherical unstable state to a cubic stable morphology,but the degree of coarsening is negligible.

关 键 词：高Ti低合金钢 TI C粒子形貌 析出行为 

分 类 号：TG142.33[一般工业技术—材料科学与工程]