等温温度对82B高碳钢过冷奥氏体转变的影响
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摘要
为研究等温温度和冷却速度对82B盘条钢组织演变规律的影响,采用DIL805A热膨胀仪测定了其静态CCT曲线和等温转变热膨胀曲线,利用扫描电镜分析了工艺参数对过冷奥氏体转变的影响,并讨论了相变孕育时间和持续时间的变化原因。结果表明:随着等温温度的降低,相变孕育时间和持续时间都呈现逐渐缩短的趋势,组织中非片层状形貌含量逐渐增多,在610℃等温及以10℃/s冷却的试验钢相变孕育时间和持续时间分别为6. 61 s和16. 50 s;而随着冷却速度的增加,相变持续时间呈现先增大后减小的趋势; 610℃等温得到的微观组织主要由片层状珠光体组成,且随着冷速的增加,珠光体片层间距逐渐减小; 550℃等温组织中出现了大量的非片层状组织形貌,珠光体的分布变得杂乱无章。
In order to study the influence of isothermal temperature and cooling rate on microstructure evolution of 82 B wire rod,the statics CCT curves and isothermal transformation thermal expansion curves were measured by DIL805 A dilatometer, and the influence of technological parameters on the microstructure evolution were analyzed by using SEM,and the reasons for the change of phase transition incubation time and duration were also discussed. The results show that with the decrease of isothermal temperature,the phase transition incubation time and duration tend to be gradually reduced,and the content of non-lamellar microconstituents in the microstructure is increased gradually. When the isothermal temperature is 610 ℃ and the cooling rate is 10 ℃/s,the phase transition incubation time is 6. 61 s and the duration is 16. 50 s. With the increase of cooling rate,the duration of phase transformation first increases and then decreases. The microstructure at isothermal temperature 610 ℃ mainly consist of lamellar pearlite. With the increase of cooling rate,the pearlite interlaminar spacing is gradually reduced; when the isothermal temperature is 550 ℃,a large amount of non-lamellar microconstituents is appeared,and at the same time,the distribution of pearlite also becomes disorganized.
In order to study the influence of isothermal temperature and cooling rate on microstructure evolution of 82 B wire rod,the statics CCT curves and isothermal transformation thermal expansion curves were measured by DIL805 A dilatometer, and the influence of technological parameters on the microstructure evolution were analyzed by using SEM,and the reasons for the change of phase transition incubation time and duration were also discussed. The results show that with the decrease of isothermal temperature,the phase transition incubation time and duration tend to be gradually reduced,and the content of non-lamellar microconstituents in the microstructure is increased gradually. When the isothermal temperature is 610 ℃ and the cooling rate is 10 ℃/s,the phase transition incubation time is 6. 61 s and the duration is 16. 50 s. With the increase of cooling rate,the duration of phase transformation first increases and then decreases. The microstructure at isothermal temperature 610 ℃ mainly consist of lamellar pearlite. With the increase of cooling rate,the pearlite interlaminar spacing is gradually reduced; when the isothermal temperature is 550 ℃,a large amount of non-lamellar microconstituents is appeared,and at the same time,the distribution of pearlite also becomes disorganized.
引文
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[17]Kumar A,Mcculloch C,Hawbolt E B,et al. Modelling thermal and microstructural evolution on runout table of hot strip mill[J].Materials Science and Technology,1991,7(4):360-368.
[2]付军,郝芳,王福明,等.变形温度对高碳钢82B动态CCT曲线的影响[J].金属热处理,2011,36(10):55-58.Fu Jun, Hao Fang, Wang Fuming, et al. Effect of deformation temperature on dynamic CCT curve of high carbon steel 82B[J]. Heat Treatment of Metals,2011,36(10):55-58.
[3]杨峰,孙玉领. SWRS82B钢盘条的显微组织对力学性能的影响[J].金属热处理,2013,38(5):104-107.Yang Feng, Sun Yuling. Effect of microstructure on mechanical properties of SWRS82B steel wire rod[J]. Heat Treatment of Metals,2013,38(5):104-107.
[4]杨峰,孙玉领. SWRS82B盘条冷拔过程中显微组织和力学性能的变化[J].金属热处理,2014,39(5):22-26.Yang Feng,Sun Yuling. Variation of microstructure and mechanical properties of SWRS82B wire rod during cold drawing[J]. Heat Treatment of Metals,2014,39(5):22-26.
[5]杨叠,杨柳青,隋永莉,等. X80钢管环焊缝连续冷却转变曲线研究[J].机械制造文摘(焊接分册),2016,12(3):14-19.Yang Die,Yang Liuqing,Sui Yongli,et al. Research on CCT curves of X80 pipeline girth weld[J]. Jixie Zhizao Wenzhai(Hanjie Fence),2016,12(3):14-19.
[6]李文亚,杨维宇.一种空冷贝氏体钢连续冷却转变曲线的测定[J].包钢科技,2016,42(5):55-57.Li Wenya,Yang Weiyu. Determination of CCT curves of one kind of air-cooling bainite steel[J]. Science and Technology of Baotou Steel(Group)Corporation,2016,42(5):55-57.
[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 65MnCr[J]. Transactions of Materials and Heat Treatment,2016,37(9):144-150.
[8]张金,刘丰收,俞喆.贝氏体钢轨钢连续冷却转变曲线的测定及分析[J].热加工工艺,2016,45(4):84-86.Zhang Jin,Liu Fengshou,Yu Zhe. Determination and analysis of CCT curves of bainite steel used in rail steel[J]. Hot Working Technology,2016,45(4):84-86.
[9]熊虎,梁宇,李静.高碳盘条钢等温转变动力学曲线与微观组织[J].金属热处理,2016,12(41):5-9.Xiong Hu,Liang Yu,Li Jing. Isothermal transformation kinetic curves and microstructure of high carbon wire steel[J]. Heat Treatment of Metals,2016,12(41):5-9.
[10]陈家龙,余万华,陈苏冬,等. TRIP780钢贝氏体区等温转变的规律[J].钢铁研究学报,2016,28(4):64-68.Chen Jialong,Yu Wanhua,Chen Sudong,et al. Transformation rule of TRIP780 steel in isothermal bainite area[J]. Journal of Iron and Steel Research,2016,28(4):64-68.
[11]廖琳琳,黎立璋,严海峰,等. 82B高碳钢静态CCT曲线及显微组织[J].金属热处理,2017,42(8):30-35.Liao Linlin,Li Lizhang,Yan Haifeng,et al. Static CCT curves and microstructure of 82B high carbon steel[J]. Heat Treatment of Metals,2017,42(8):30-35.
[12]武会宾,巨彪,车英建.等温温度对超细贝氏体钢组织演变规律的影响[J].北京科技大学学报,2016,38(12):1741-1746.Wu Huibin, Ju Biao, Che Yingjian. Effect of austempering temperature on the microstructure evolution of ultrafine bainite steel[J]. Journal of University of Science and Technology Beijing,2016,38(12):1741-1746.
[13]徐光,王巍,张鑫强.金属材料CCT曲线测定及绘制[M].北京:化学工业出版社,2009.
[14]陈响军.金属材料微观组织演变计算方法及在热成型中的应用[D].长沙:湖南大学,2016.
[15]宋维锡.金属学[M]. 2版.北京:冶金工业出版社,1989.
[16]Maccagno T M,Jonas J J,Hodgson P D. Spreadsheet modelling of grain size evolution during rod rolling[J]. ISIJ International,1996,36(6):720-728.
[17]Kumar A,Mcculloch C,Hawbolt E B,et al. Modelling thermal and microstructural evolution on runout table of hot strip mill[J].Materials Science and Technology,1991,7(4):360-368.