热压缩法研究TiC形变诱导析出动力学  

Kinetics of strain induced precipitation of TiC by hot compression method

作　　者：王志勇[1] 宋欣[1] 王振强[2] 刘春明[2] 孙新军[3] 

机构地区：[1]秦皇岛首秦金属材料有限公司轧钢事业部,河北秦皇岛066000 [2]首钢技术研究院宽厚板研究所,北京100043 [3]钢铁研究总院工程用钢研究所,北京100081

出　　处：《钢铁》2015年第10期90-95,共6页Iron and Steel

摘　　要：为了阐明低成本钛微合金化钢在奥氏体区热轧过程中的析出行为,在Gleeble-1500D热模拟试验机上采用热压缩应力松弛法、双道次变形法和透射电镜(TEM)研究了0.047C-0.109Ti微合金钢中的形变诱导析出动力学。通过分析应力松弛曲线、软化动力学曲线及不同等温时间析出相的数量和尺寸分别获得了3组析出-时间-温度(PTT)曲线。结果表明,3种方法获得的PTT曲线均呈现"C"形,且鼻子点温度均为900℃左右。在析出开始时间(Ps)的测量方面,双道次变形法展现出最高的敏感性和可靠性。TEM结果表明,形变诱导析出相为纯的Ti C粒子,在复型膜上呈现链状或胞状分布。此外,析出相在长大阶段近似服从抛物线规律(1/2方规律),在粗化阶段服从近1/10方规律。The kinetics of strain induced precipitation in a 0.047%C-0.109%Ti micro-alloyed steel was studied by a stress relaxation（SR）method,a two-stage interrupted compression（TS） method and transmission electron microscopy（TEM）in Gleeble 1500 D thermal testing. Three groups of precipitation-time-temperature（PTT） diagrams were obtained by analyzing stress relaxation curves,softening kinetic curves and the amounts and sizes of strain induced precipitates at various isothermal holding times. The results showed that the PTT diagrams by three methods all exhibited typical＂C＂shape,and the nose temperatures of them located at approximately 900 ℃. The two-stage interrupted method shows the highest reliability and sensitivity in terms of the determination of the onset time of precipitation（Ps）. TEM results showed that the strain induced precipitates identified with fcc structure（B1 Na Cl structure） were pure Ti C particles,and were distributed in a chain-like and a cell-like manner on carbon replica. In addition,the precipitates followed a parabolic law（1/2 law）during the growth stage,and obeyed a 1/10 law during the coarsening stage.

关 键 词：形变诱导析出 析出动力学 钛微合金钢 PTT曲线 

分 类 号：TG142.1[一般工业技术—材料科学与工程]