稀土La对高铌钢应变诱导析出行为的影响
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摘要
在未加镧和添加镧两种成分高铌钢的基础上,应用Gleeble-1500D热模拟试验机进行压缩试验,得到了试验钢在900℃等温弛豫时的应力松弛曲线。运用Thermo Icap6300电感耦合等离子体原子发射光谱仪、ZEISS Supra55型场发射扫描电子显微镜和Tecnai F30场发射透射电子显微镜,研究了试验钢弛豫淬火后铌的固溶量、含铌相析出行为的变化规律。结果表明,La抑制了含铌相在900℃(奥氏体区)的析出动力学过程,延长了含铌相在900℃(奥氏体区)的应变诱导析出开始时间(约14 s)及结束时间(约36 s)。当加热温度为1250℃时,La使加热过程中铌的固溶量百分比提高30.6%。等温弛豫后,La使等温弛豫过程中铌的析出量百分比增加了29.6%,析出物颗粒尺寸有所粗化。
Compression test of low carbon high Nb steel with and without La element was carried out on a Gleeble 1500 D thermal simulator,and the stress relaxation curves of the experiment steel were obtained at 900 ℃. The solid solubility,second phase precipitation behavior of the steel after quenching were studied by means of thermo Icap6300 inductively coupled plasma atomic emission spectrometer,ZEISS Supra55 type field emission scanning electron microscopy and Tecnai F30 field emission transmission electron microscopy. The results show that La addition inhibits the precipitation kinetics process of the second phase with Nb at 900 ℃( austenite). La extends second phase with Nb strain induced precipitation start time about 14 s and end time about 36 s at 900 ℃( austenite). When the heating temperature is 1250 ℃,La addition increases the solution of Nb percentage by 30. 6%. After isothermal relaxation,La addition increases the percentage of niobium precipitation by 29. 6%,and the grain size increases more.
Compression test of low carbon high Nb steel with and without La element was carried out on a Gleeble 1500 D thermal simulator,and the stress relaxation curves of the experiment steel were obtained at 900 ℃. The solid solubility,second phase precipitation behavior of the steel after quenching were studied by means of thermo Icap6300 inductively coupled plasma atomic emission spectrometer,ZEISS Supra55 type field emission scanning electron microscopy and Tecnai F30 field emission transmission electron microscopy. The results show that La addition inhibits the precipitation kinetics process of the second phase with Nb at 900 ℃( austenite). La extends second phase with Nb strain induced precipitation start time about 14 s and end time about 36 s at 900 ℃( austenite). When the heating temperature is 1250 ℃,La addition increases the solution of Nb percentage by 30. 6%. After isothermal relaxation,La addition increases the percentage of niobium precipitation by 29. 6%,and the grain size increases more.
引文
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[2]张玲,薛春霞,杨王玥,等.粗晶奥氏体HTP钢中形变诱导析出的定量研究[J].金属学报,2007,43(8):791-796.ZHANG Ling,XUE Chun-xia,YANG Wang-yue,et al.Quantitative investigation of deformation induced precipitation in coarse grained austenite HTP steel[J].Acta Metallurgica Sinica,2007,43(8):791-796.
[3]苑少强,杨善武,武会宾,等.含Nb微合金钢变形后弛豫及时效过程中的析出行为[J].金属热处理,2005,30(1):24-27.YUAN Shao-qiang,YANG Shan-wu,WU Hui-bin,et al.Precipitation behavior during relaxation after deformation and aging in microalloy steel containing Nb[J].Heat Treatment of Metals,2005,30(1):24-27.
[4]李鸿美,曹建春,孙力军,等.含铌微合金钢碳氮化物析出行为研究的现状及发展[J].材料导报,2010,24(9):84-87.LI Hong-mei,CAO Jian-chun,SUN Li-jun,et al.Current situation and development of Nb microalloyed steel carbonitride precipitation behavior[J].Materials Review,2010,24(9):84-87.
[5]董洪波,康永林,王克鲁.Mn-Nb-Cu-B低碳贝氏体钢的析出动力学[J].材料热处理学报,2011,32(11):44-47.DONG Hong-bo,KANG Yong-lin,WANG Ke-lu.Precipitation kinetics of Mn-Nb-Cu-B low carbon bainitic steel[J].Transactions of Materials and Heat Treatment,2011,32(11):44-47.
[6]邹天来,肖宝亮,董毅,等.高Nb微合金钢的静态再结晶行为研究[J].轧钢,2007,24(4):4-6.ZOU Tian-lai,XIAO Bao-liang,DONG Yi,et al.Study on static recrystallization behavior of Nb-microalloyed steel[J].Steel Rolling,2007,24(4):4-6.
[7]赵英利,时捷,刘苏,等.中碳铌微合金钢的应变诱导析出行为[J].钢铁,2010,45(2):99-101.ZHAO Ying-li,SHI Jie,LIU Su,et al.Strain-induced precipitation behavior in medium-carbon Nb microalloyed steels[J].Iron and Steel,2010,45(2):99-101.
[8]周惦武,彭平,徐少华,等.稀土元素在钢中的应用与研究[J].铸造设备研究,2004,(3):35-38.ZHOU Dian-wu,PENG ping,XU Shao-hua,et al.Research and application of rare earth in steel[J].Research Studies on Foundry Equipment,2004,(3):35-38.
[9]李春龙.稀土在钢中应用与研究新进展[J].稀土,2013,34(3):78-85.LI Chun-long.New development of research on rare earth application in steels[J].Chinese Rare Earths,2013,34(3):78-85.
[10]刘宏亮,刘承军,王云盛,等.稀土对X80管线钢中铌元素赋存状态的影响[J].稀土,2011,32(5):6-10.LIU Hong-liang,LIU Cheng-jun,WANG Yun-sheng,et al.Effect of rare earths on the occurrence of Nb in X80 pipeline steel[J].Chinese Rare Earths,2011,32(5):6-10.
[11]曹雅彬.高Nb微合金钢中Nb的溶解/析出及其对组织演变影响的研究[D].河北:燕山大学,2012.
[12]邓素怀,刘清友,董翰,等.Nb的析出对变形诱导铁素体相变的影响[J].钢铁,2005,40(7):64-67.DENG Su-huai,LIU Qing-you,DONG Han,et al.Effect of precipitation of Nb on deformation induced ferrite transformation[J].Iron and Steel,2005,40(7):64-67.
[13]王岩,赵爱民,陈银莉,等.卷取温度对低碳钢组织性能及Al N析出行为的影响[J].北京科技大学学报,2010,32(6):748-752.WANG Yan,ZHAO Ai-min,CHEN Yin-li,et al.Effect of coiling temperature on the Al N precipitation,microstructure and mechanical properties of low carbon steel[J].Journal of University of Science and Technology Beijing,2010,32(6):748-752.
[14]方芳,尹云洋,雍岐龙.碳和氮含量对V(C,N)在形变奥氏体中析出的影响[J].钢铁,2011,46(3):60-65.FANG Fang,YIN Yun-yang,YONG Qi-long.Effect of C and N content on the behavior of V(C,N)precipitate in deformed austenite[J].Iron and Steel,2011,46(3):60-65.
[15]齐亮,张迎晖,汪志刚,等.X100管线钢中Nb和Ti碳氮化物复合析出行为[J].材料热处理学报,2014,35(11):75-80.QI Liang,ZHANG Ying-hui,WANG Zhi-gang et al.Complex precipitation behaviour of Nb and Ti carbonitride in X100 pipeline steel[J].Transactions of Materials and Heat Treatment,2014,35(11):75-80.