差示扫描量热法测定22Mn2SiVBS钢CCT曲线
MEASUREMENT FOR CCT CURVE OF 22Mn2SiVBS STEEL BY DIFFERENTIAL SCANNING CALORIMETER
摘 要
在STA-409PC型同步热分析仪上,利用差示扫描量热法对自行设计的低碳空冷贝氏体钢(22Mn2SiVBS钢)进行相变点的测定和显微组织观察,并结合相变点的计算公式对比分析,绘制钢的CCT曲线,验证理论计算公式的正确性。结果表明：该钢的奥氏体转变开始温度A1点为732℃,转变终了温度A3点为836℃;珠光体临界冷却速度是(vP)0.667℃ /s,铁素体临界冷却速度(vF)1.16℃/s,与理论计算结果符合较好;控制该钢的轧(锻)后空冷速度为：vF≤v实际＜vB,可以得到以粒状贝氏体为主的显微组织,钢具有强韧性配合良好的力学性能。
DSC
非调质钢
continuous cooling transformation diagram
DSC
non-quenched and tempered steel
Abstract
Transformation point and microstructure of self-designed low carbon air cooling bainite steel 22Mn2SiVBS was tested using differential scanning calorimeter on STA-409PC synchronism thermal analyzer,and by contrast and analysis for theoretical transformation point formula,the CCT curve was drawn,and the correctness of theoretical formula was validated.The result show that the beginning temperature of the austenite transformation is 732℃,the ending temperature of the austenite transformation is 836℃;the critical cooling rate of pearlite(vP) is 0.667℃ /s,the critical cooling rate of ferrite(vF)is 1.16℃/s,it accords with theoretical value commendably;When the air cooling rate is controlled as vF≤vture＜vB ,it can obtain the microstructure consisting mostly of granular bainite,the steel has the combination of excellent strength and toughness .
中图分类号 TG151.3
所属栏目 试验技术与方法
基金项目 吉科合字重大科技攻关项目(2005315)
收稿日期 2008/7/15
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备注吴 化(1957-),男,教授,博士。
引用该论文: WU Hua,LIU Shan-shan. MEASUREMENT FOR CCT CURVE OF 22Mn2SiVBS STEEL BY DIFFERENTIAL SCANNING CALORIMETER[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2008, 44(12): 684～688
吴 化,刘姗姗. 差示扫描量热法测定22Mn2SiVBS钢CCT曲线[J]. 理化检验－物理分册, 2008, 44(12): 684～688
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参考文献
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【2】林慧国,傅代直. 钢的奥氏体转变曲线——原理、测试与应用[M]. 北京: 机械工业出版社,1988．
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【5】Wu Hua,Liu Cheng. Zhao Zhenbo,et al. Sanjiwan bhoie design of air-cooled bainitic microalloyed steel for a heavy truck front axle beam[J]. Materials and Design,2006,27:651-656．
【6】Bahdeshia H,Edmonds D V. Bainite in silicon steels: new composition2p roperty app roach part[J]. Met Sci,1983,17:411-419．
【7】黄维刚,方鸿生,郑燕康. Si和少量Mo对Mn2B系贝氏体钢转变动力学的影响[J]. 金属热处理,1997,22 (10) : 25-28．
【8】Huo Yan-qiu ,Long Xiu-hui ,Zhou Zhen-hua ,et al.Bainite transformation and TRIP effect in 20Mn2SiVB steel[J].Materials Science and Engineering,2006,A (438-440):158-161．
【2】林慧国,傅代直. 钢的奥氏体转变曲线——原理、测试与应用[M]. 北京: 机械工业出版社,1988．
【3】王占学. 控制轧制与控制冷却[M]. 北京: 冶金工业出版社,1988．
【4】吴 化.低合金高强度高塑性复相钢材的成分设计[D].上海：上海东华大学材料科学与工程学院,2007．
【5】Wu Hua,Liu Cheng. Zhao Zhenbo,et al. Sanjiwan bhoie design of air-cooled bainitic microalloyed steel for a heavy truck front axle beam[J]. Materials and Design,2006,27:651-656．
【6】Bahdeshia H,Edmonds D V. Bainite in silicon steels: new composition2p roperty app roach part[J]. Met Sci,1983,17:411-419．
【7】黄维刚,方鸿生,郑燕康. Si和少量Mo对Mn2B系贝氏体钢转变动力学的影响[J]. 金属热处理,1997,22 (10) : 25-28．
【8】Huo Yan-qiu ,Long Xiu-hui ,Zhou Zhen-hua ,et al.Bainite transformation and TRIP effect in 20Mn2SiVB steel[J].Materials Science and Engineering,2006,A (438-440):158-161．
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