Cr-Mo系调质钢的连续冷却转变规律
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摘要
采用DIL805L淬火相变膨胀仪研究了一种Cr-Mo系合金结构钢在连续冷却过程中的相变规律,膨胀法与金相-硬度法结合,绘制出该钢的连续冷却转变曲线。结果表明:当冷速小于0.1℃/s时,主要发生铁素体/珠光体转变;冷速增大,贝氏体和马氏体相继出现,当冷速在0.5～1.5℃/s时,发生铁素体/珠光体和贝氏体转变;冷速大于3℃/s时,马氏体开始出现,硬度值随着冷速的升高不断增大,合金元素Cr、Mo的加入大大提高了试验钢的淬透性。
The phase transformation law of a Cr-Mo alloy structural steel during continuous cooling was studied by using a DIL805L dilatometer.The continuous cooling transformation(CCT) curves was drawn by combining with thermal dilatometric analysis,microstructure observation and hardness measurement.The results show that ferrite and pearlite are resulted when the cooling rate of supercooled austenite is less than 0.1 ℃/s.As the cooling rate increases,bainite and martensite are resulted successively.When the cooling rate is between 0.5-1.5 ℃/s,ferrite/pearlite and bainite transformation are resulted.Martensite appears when the cooling rate is greater than 3 ℃/s,and with the cooling rate increases,the hardness value increases,Cr and Mo additions greatly improve the hardenability of the tested steel.
The phase transformation law of a Cr-Mo alloy structural steel during continuous cooling was studied by using a DIL805L dilatometer.The continuous cooling transformation(CCT) curves was drawn by combining with thermal dilatometric analysis,microstructure observation and hardness measurement.The results show that ferrite and pearlite are resulted when the cooling rate of supercooled austenite is less than 0.1 ℃/s.As the cooling rate increases,bainite and martensite are resulted successively.When the cooling rate is between 0.5-1.5 ℃/s,ferrite/pearlite and bainite transformation are resulted.Martensite appears when the cooling rate is greater than 3 ℃/s,and with the cooling rate increases,the hardness value increases,Cr and Mo additions greatly improve the hardenability of the tested steel.
引文
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[2]马鸣图.汽车用合金结构钢的现状和研究进展(一)[J].汽车工艺与材料,2004(2):7-11.Ma Mingtu.State of the art and review of automobile-used alloy structure steel(Ⅰ)[J].Automobile Technology and Material,2004(2):7-11.
[3]李敬民,黄文荣,李昌安,等.大型薄壁焊接30CrMoA钢壳体的热处理[J].金属热处理,2014,39(12):58-60.Li Jingmin,Huang Wenrong,Li Chang'an,et al.Heat treatment of large-sized thin wall welding 30CrMoA steel shell[J].Heat Treatment of Metals,2014,39(12):58-60.
[4]吕红英,周旭东,陈学文.QP980钢CCT曲线的测定[J].材料热处理学报,2018,39(4):139-144.LüHongying,Zhou Xudong,Chen Xuewen,et al.Determination of CCT curves of DP980 steel[J].Transactions of Materials and Heat Treatment,2018,39(4):139-144.
[5]崔忠圻,覃耀春.金属学与热处理[M].北京:机械工业出版社,2007:239-268.
[6]丁文圆,赵飞,张欢,等.CLAM钢CCT曲线的测定与分析[J].材料热处理学报,2017,38(7):101-106.Ding Wenyuan,Zhao Fei,Zhang Huan,et al.Determination and analysis of CCT curves of CLAM steel[J].Transactions of Materials and Heat Treatment,2017,38(7):101-106.
[7]陈涛,赵爱民,樊红亮,等.65MnCr耐磨钢的连续冷却曲线和相变规律[J].材料热处理学报,2016,37(9):144-150.Chen Tao,Zhao Aimin,Fan Hongliang,et al.Continuous cooling curve and phase transformation behavior of wear resistant steel 65Mn Cr[J].Transactions of Materials and Heat Treatment,2016,37(9):144-150.
[8]桂晓露,刘蓉,高古辉,等.Cr元素对贝氏体钢连续转变规律的影响[J].材料热处理学报,2016,37(10):154-158.Gui Xiaolu,Liu Rong,Gao Guhui,et al.Effect of Cr on continuous cooling transformation characteristic of bainitic steel[J].Transactions of Materials and Heat Treatment,2016,37(10):154-158.
[9]牛枫,赵爱民,赵征志,等.铬对超高强冷轧双相钢相变和组织性能的影响[J].钢铁研究学报,2010,22(7):47-50.Niu Feng,Zhao Aimin,Zhao Zhengzhi,et al.Effect of Cr on transformation,microstructure and properties of Ultra-High strength cold-Rolled dual phase steel[J].Journal of Iron and Steel Research,2010,22(7):47-50.
[10]Han Futao,Hwang Byoungchul,Suh Dong-Woo,et al.Effect of molybdenum and chromium on hardenability of low-carbon boron-added steels[J].Metals and Materials International,2008,14(6):667-672.
[11]于思荣,朱先勇,高乾,等.合金元素对球墨铸铁抗热疲劳性能的影响[J].铸造技术,2010,31(6):691-694.Yu Sirong,Zhu Xianyong,Gao Qian,et al.Effects of alloying elements on thermal fatigue properties of ductile iron[J].Foundry Technology,2010,31(6):691-694.
[12]刘宗昌.合金结构钢显微组织辨识[M].北京:高等教育出版社,2017:82-122.
[13]安治国,黄艳新,侯环宇,等.汽车前轴用贝氏体型非调质钢连续冷却转变[J].钢铁,2016,51(12):70-73.An Zhiguo,Huang Yanxin,Hou Huanyu,et al.Continuous cooling transformation of bainite non-quenched and tempered steel for automobile front axle[J].Iron and Steel,2016,51(12):70-73.
[14]孙艳容,王杰,杨锦,等.热处理制度对IN718变形合金组织和性能的影响[J].金属热处理,2018,43(12):152-159.Sun Yanrong,Wang Jie,Yang Jin,et al.Effect of heat treatment on microstructure and mechanical properties of IN718 deformed alloy[J].Heat Treatment of Metals,2018,43(12):152-159.