工程科学学报2016，Vol.38Issue(3)：371-378,8.DOI:10.13374/j.issn2095-9389.2016.03.011
原位观察TiN粒子对低合金高强度钢模拟焊接热影响区粗晶区晶粒细化作用
In-situ observations of grain refinement by TiN particles in the simulated coarse-grained heat-affected zone of a high-strength low-alloy steel
摘要
Abstract
The effect of grain refinement by TiN particles in the simulated coarse-grained heat-affected zone of a high-strength low-alloy steel was investigated by means of analytical characterization techniques such as in-situ microscopy and electron back scat-tered diffraction analysis. Abundant finely dispersed nanoscale TiN particles form in the specimen and effectively retard the grain boundary migration during simulated high heat input welding, which results in refined austenite grains. TiN precipitates on the surface of aluminum oxide, which is the effective nucleation site for acicular ferrite during the cooling process and induces the austenite trans-form to the fine-grained mixed microstructure of a small proportion of acicular ferrite embedded in predominantly bainite.关键词
高强度钢/低合金钢/热影响区/晶粒细化/氮化钛/原位观察Key words
high-strength steels/low-alloy steels/heat-affected zone/grain refinement/titanium nitride/in-situ observation分类
矿业与冶金引用本文复制引用
万响亮,李光强,吴开明..原位观察TiN粒子对低合金高强度钢模拟焊接热影响区粗晶区晶粒细化作用[J].工程科学学报,2016,38(3):371-378,8.基金项目
中国博士后科学基金资助项目(2014M550414) （2014M550414）
武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室开放基金资助项目(FMRU201306) （FMRU201306）
