含稀土高铌钢的等温弛豫行为
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摘要
使用Gleeble-1500D型热模拟试验机对含稀土高铌钢进行了900℃等温弛豫试验,采用激光共焦显微镜、扫描电子显微镜和维氏硬度计等研究了试验钢弛豫淬火后的显微组织、含铌第二相的析出行为和硬度。结果表明:试验钢等温弛豫时的应力松弛过程分为三个阶段,分别为析出相的形核、长大和粗化阶段,第二相析出开始和结束时间分别为10s和433s;随着等温弛豫时间的延长,贝氏体板条束的尺寸逐渐减小,板条组织得到了明显的细化,析出相为均匀分布的球状颗粒物;试验钢硬度随弛豫时间的延长先升高后降低。
The isothermal relaxation experiments of the high niobium steels containing rare earth were conducted at 900 ℃ using Gleeble-1500 Dsimulator.The microstructures,precipitation behavior of second niobium containing phase and hardness of the steel after isothermal relaxation followed by quenching were studied using laser confocal microscopy,scanning electron microscopy and Vickers hardness tester.The results show that the stress relaxation process of the experimental steel was divided into three stages of precipitation nucleation,growth and coarsening.The start and end time of second phase precipitation was 10 sand 433srespectively.With the increase of the isothermal relaxation time,the bainite lath size decreased gradually and the lath microstructure was refined significantly.The precipitations consisted of evenly distributed spherical particles.The hardness of the experimental steel first increased then decreased with the increase of the relaxation time.
The isothermal relaxation experiments of the high niobium steels containing rare earth were conducted at 900 ℃ using Gleeble-1500 Dsimulator.The microstructures,precipitation behavior of second niobium containing phase and hardness of the steel after isothermal relaxation followed by quenching were studied using laser confocal microscopy,scanning electron microscopy and Vickers hardness tester.The results show that the stress relaxation process of the experimental steel was divided into three stages of precipitation nucleation,growth and coarsening.The start and end time of second phase precipitation was 10 sand 433srespectively.With the increase of the isothermal relaxation time,the bainite lath size decreased gradually and the lath microstructure was refined significantly.The precipitations consisted of evenly distributed spherical particles.The hardness of the experimental steel first increased then decreased with the increase of the relaxation time.
引文
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[2]钟荣,张志波,阴树标,等.未再结晶区控轧控冷工艺对低碳高铌钢组织的影响[J].机械工程材料,2013,37(1):59-62,97.
[3]王有铭,李曼云,韦光.钢材的控制轧制和控制冷却[M].北京:冶金工业出版社,1995.
[4]蔡爱国.铌钒微合金中碳钢的微观组织与强度的关系[J].钢铁研究学报,1996,8(2):35-39.
[5]陈国安,杨王明,郭守真,等.低碳微量铌钢形变强化相变的组织演变[J].金属学报,2004,40(10):1076-1084.
[6]东涛,付俊岩.铌/钒微合金化400MPaⅢ级钢筋的生产技术[J].中国冶金,2004(5):1-5.
[7]付俊岩.Nb微合金化和含铌钢的发展及技术进步[J].钢铁,2005,40(8):1-6.
[8]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.
[9]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.
[10]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.
[11]刘微,王立群,陈新旺.含铌钢第二相粒子固溶析出规律研究[J].山东冶金,2004,26(S1):170-172.
[12]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.
[13]刘宏亮,刘承军,王云盛,等.稀土管线钢轧制工艺的模型研究[J].稀土,2011,32(3):1-7.
[14]林勤,宋波,郭兴敏,等.钢中稀土微合金化作用与应用前景[J].稀土,2001,22(4):31-36.
[15]李春龙.稀土在钢中应用与研究新进展[J].稀土,2013,34(3):78-85.
[16]苑少强,王振良,褚祥治.贝氏体组织的弛豫细化[J].金属热处理,2005,30(4):43-45.
[17]王春,苑少强.奥氏体变形后等温不同时间对超低碳微合金钢组织细化的影响[J].机械设计与制造,2008(3):136-137.
[18]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].秦皇岛:燕山大学,2012.
[19]武会宾,杨善武,苑少强,等.等温弛豫对微合金钢中非平衡组织热稳定性的影响[J].金属学报,2005,41(4):385-391.