热处理
熱處理
열처리
HEAT TREATMENT
2015年
1期
20-23
,共4页
杨鲁明%任慧平%金自力%刘宗昌
楊魯明%任慧平%金自力%劉宗昌
양로명%임혜평%금자력%류종창
贝氏体钢轨%热轧%热模拟
貝氏體鋼軌%熱軋%熱模擬
패씨체강궤%열알%열모의
bainitic steel rail%hot-rolling%thermal simulation
采用Gleeble-1500D热模拟试验机研究了KB1250贝氏体钢轨在不同条件下热变形时的再结晶行为。分析了变形工艺参数对该钢轨再结晶行为的影响。结果表明,KB1250贝氏体钢轨在1100℃热轧时发生动态再结晶,而在900~1050℃热轧仅发生少量的动态回复;在1000℃、1050℃变形时,静态再结晶分数即软化率几乎达到1.0。KB1250贝氏体钢轨被多道次压缩时,变形温度低有利于晶粒细化,而变形温度高则容易发生混晶。
採用Gleeble-1500D熱模擬試驗機研究瞭KB1250貝氏體鋼軌在不同條件下熱變形時的再結晶行為。分析瞭變形工藝參數對該鋼軌再結晶行為的影響。結果錶明,KB1250貝氏體鋼軌在1100℃熱軋時髮生動態再結晶,而在900~1050℃熱軋僅髮生少量的動態迴複;在1000℃、1050℃變形時,靜態再結晶分數即軟化率幾乎達到1.0。KB1250貝氏體鋼軌被多道次壓縮時,變形溫度低有利于晶粒細化,而變形溫度高則容易髮生混晶。
채용Gleeble-1500D열모의시험궤연구료KB1250패씨체강궤재불동조건하열변형시적재결정행위。분석료변형공예삼수대해강궤재결정행위적영향。결과표명,KB1250패씨체강궤재1100℃열알시발생동태재결정,이재900~1050℃열알부발생소량적동태회복;재1000℃、1050℃변형시,정태재결정분수즉연화솔궤호체도1.0。KB1250패씨체강궤피다도차압축시,변형온도저유리우정립세화,이변형온도고칙용역발생혼정。
Recrystallization behavior of KB1250 bainitic steel rail during hot deformation under different conditions was investigated by a Gleeble-1500D thermal simulation machine.The effect of deformation process parameters on recrystallization behavior of the rail was analyzed.The results show that for the KB1250 bainitic steel rail,the dynamic recrystallization will occur during hot-rolling at 1 100 ℃,whereas a small amount of dynamic recovery occurs only during hot-rolling at from 900 to 1050 ℃,and that the static recrystallization fraction,i.e.softening rate,is as great as approximately 1 .0 during deforming at 1000 ℃or 1050 ℃.In addition,when being multipass compressed,lower deformation temperature is beneficial to grain refinement,but the compression at higher temperatures will be easy to form mixed crystal for the KB1250 bainitic steel rail.