工程科学学报2017，Vol.39Issue(4)：520-528,9.DOI:10.13374/j.issn2095-9389.2017.04.006
钛和钒对高锰钢高温热延性的影响
Influence of Ti and V on the hot ductility of high manganese austenitic steel
摘要
Abstract
The influence of Ti(mass fraction 0.10％)and the joint additions of Ti(mass fraction 0.11％)and V(mass fraction 0.20％)on the hot ductility of as-cast high manganese austenitic steels were studied using a Gleeble-3500 thermo-mechanical simulator over a temperature range of 700 to 1200℃.Fracture surfaces and particles precipitated at different testing temperatures were investigated via scanning electron microscopy(SEM)and X-ray energy dispersive spectrometry(EDS).The hot ductility curves as a function of temperature of high-Mn austenitic steels showed that Ti addition leads to loss of ductility in almost the entire testing temperature range.Moreover,the joint additions of Ti and V do not exhibit any improvement in the hot ductility,resulting in relatively poor hot ductility behavior.The phase diagrams of precipitates in Ti-and Ti-V-bearing high-Mn austenitic steels in the temperature range of 700 to 1600℃ were calculated via Thermo-Calc commercial software.The calculation results show that Ti(C,N)in Ti-bearing high-Mn steel precipitates at 1499℃,which is much higher than its liquidus temperature.This illustrates that Ti(C,N)particles form in the liquid steel.SEM-EDS results show that Ti(C,N)and(Ti,V)C particles form along the austenitic grain boundaries and the triple junction.These particles retard the occurrence of dynamic recrystallization and accelerate the extension of cracks near the grain boundaries.关键词
锰钢/拉伸实验/热延性/钒/钛/动态再结晶Key words
manganese steels/tensile tests/hot ductility/vanadium/titanium/dynamic recrystallization分类
矿业与冶金引用本文复制引用
刘洪波,刘建华,丁浩,吴博威,张杰,苏晓峰..钛和钒对高锰钢高温热延性的影响[J].工程科学学报,2017,39(4):520-528,9.基金项目
国家自然科学基金资助项目(51574022) （51574022）
