| 变形条件对Mn-Cr齿轮钢连续冷却相变的影响 |
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| 引用本文： | 王秉新,周存龙,刘相华,王国栋. 变形条件对Mn-Cr齿轮钢连续冷却相变的影响[J]. 金属学报, 2005, 41(5): 511-516 |
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| 作者姓名： | 王秉新 周存龙 刘相华 王国栋 |
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| 作者单位： | 东北大学轧制技术及连轧自动化国家重点实验室,沈阳,110004;沈阳工程学院动力工程系,沈阳,110036;东北大学轧制技术及连轧自动化国家重点实验室,沈阳,110004;太原科技大学材料科学与工程学院,太原,030024;东北大学轧制技术及连轧自动化国家重点实验室,沈阳,110004 |
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| 基金项目： | 国家重点基础研究发展规划资助项目G2000067208-4 |
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| 摘 要： | 使用Gleeble 1500热模拟实验机研究了Mn—Cr齿轮钢在奥氏体再结晶区不同温度变形后的连续冷却相变行为及相变组织．实验结果表明，变形温度降低，促进了多边形铁索体及珠光体相变，获得多边形铁索体加珠光体混合组织的临界冷速增大．贝氏体与针状铁索体之间存在相互竞争机制，随着变形温度及冷速的降低，大量的晶界仿晶型铁索体占据了奥氏体晶界，中温相变产物由贝氏体向针状铁索体转变．降低变形温度，奥氏体在中温相变区稳定性增加，相变结束温度下降，室温组织中马氏体／奥氏体岛的数量增多．
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| 关 键 词： | Mn-Cr齿轮钢 奥氏体变形 相变 显微组织 |
| 文章编号： | 0412-1961(2005)05-0511-06 |
EFFECT OF DEFORMATION CONDITIONS ON CONTINUOUS COOLING TRANSFORMATION OF A Mn-Cr GEAR STEEL |
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| Wang Bingxin,ZHOU Cunlong,LIU Xianghua,WANG Guodong. EFFECT OF DEFORMATION CONDITIONS ON CONTINUOUS COOLING TRANSFORMATION OF A Mn-Cr GEAR STEEL[J]. Acta Metallurgica Sinica, 2005, 41(5): 511-516 |
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| Authors: | Wang Bingxin ZHOU Cunlong LIU Xianghua WANG Guodong |
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| Affiliation: | WANG Bingxin,ZHOU Cunlong,LIU Xianghua,WANG Guodong State Key Laboratory of Rolling & Automation,Northeastern University,Shenyang 110004 Department of Dynamic Power Engineering,Shenyang Engineering College,Shenyang 110036 College of Materials Science & Engineering,Taiyuan University of Science & Technology,Taiyuan 030024 |
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| Abstract: | The continuous cooling transformation behavior and microstructure for a Mn-Cr gear steel were investigated at different deformation temperatures in recrystallization region of austenite using a Gleeble 1500 hot simulator. The experimental results show that the decrease of deformation temperature promotes the formation of polygonal ferrite and pearlite, leading to the increase of critical cooling rate obtained polygonal ferrite plus pearlite microstructure. A competitive mechanism exists between the acicular ferrite and bainite formations. The grain boundary allotriomorphic ferrite decorates the austenite grain surfaces with decreasing deformation temperature and cooling rate, which causes a transition from bainite to acicular ferrite. With decreasing deformation temperature, the stability of austenite against acicular ferrite reaction increases, resulting in the decrease in bainite finished temperature and increase of M/A island. |
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| Keywords: | Mn-Cr gear steel austenite deformation transformation microstructure |
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