EFFECT OF Cu ON MICROSTRUCTURE FORMING AND REFINING OF WELD METAL IN 690 MPa GRADE HSLA STEEL
Received date: 2012-02-20
Revised date: 2012-07-09
Online published: 2012-11-11
The effect of Cu on microstructure transformation and microstructure refining of the weld metal of 690 MPa grade HSLA steel was investigated by OM, TEM, EBSD and thermal expansion instrument, and the mechanism of microstructure refining was discussed. Experimental results indicate that microstructure of weld metal is composed of granular bainite, lath bainite and residual austenite. The addition of Cu content from 0.24% to 0.53% in weld metal can decrease phase transition temperature, which induces the reduction of martensite-austenite (M/A) amount from 0.62% to 0.31%, the variation of M/A shape from small bulk and bar to granular shape, the increase of residual austenite amount, and the remarkable refining of microstructure. The increase of Cu content from 0.24% to 0.53% results in the decrease of the mean size of lath block from 2.18 to 1.99 μm, the decrease of the width of lath from 0.39 to 0.36 μm, and the increase of the amount of large angle boundary, which can inhibit crack propagation, from 68.5% to 71.0%. Analysis indicates that Cu can decrease phase transition temperature, increase the stability of austenite, raise the pontential difference between ferrite free energy (Gα) and austenite free energy (Gγ), reduce the critical size of crystal nucleation. Meanwhile, low phase transition temperature can retard the diffusion rate of carbon atom and slower the growth rate of crystal grains. These factors result in the refining of substructure.
PENG Yun WANG Aihua XIAO Hongjun TIAN Zhiling . EFFECT OF Cu ON MICROSTRUCTURE FORMING AND REFINING OF WELD METAL IN 690 MPa GRADE HSLA STEEL[J]. Acta Metall Sin, 2012 , 48(11) : 1281 -1289 . DOI: 10.3724/SP.J.1037.2012.00084
[1] Li S B, Zhang J X. Dev Appl Mater, 2001; 16(6): 39
(李少兵, 张俊旭. 材料开发与应用, 2001; 16(6): 39)
[2] Montemarano T W. J Ship Prod, 1986; 2: 145
[3] Wang S C, Kao P. J Mater Sci, 1993; 28: 5169
[4] Thompson S W, Krauss G. Metall Trans, 1996; 27A: 1573
[5] Ren H P, Liu Z C, Wang H Y, Guo F L. Trans Mater Heat Treat, 2007; 28(suppl): 119
(任慧平, 刘宗昌, 王海燕, 郭凤莲. 材料热处理学报, 2007; 28(增刊): 119)
[6] Avazkonandeh M H, Haddad M, Haerian A. Mater Des, 2009; 30: 1902
[7] Babu S S. Curr Opin Solid State Mater Sci, 2004; 8: 67
[8] Farrar R A, Harrison P L. J Mater Sci, 1987; 22: 12
[9] Wang W, Liu S. Weld J, 2002; 81(7): 132
[10] Widgery D J. Met Constr, 1978; 10: 480
[11] Shackleton D. British Weld J, 1967; 1: 592
[12] Morito S, Tanaka H, Konishi H, Furuhara T, Maki T. Acta Mater, 2003; 6: 1789
[13] Singh S B, Bhadeshia H K. Mater Sci Eng, 1998; A245: 72
[14] Xue G, Zhang J H, Yao R G. China Weld, 2007; 16(1): 31
[15] Li S B, Zhang J X, Zhu B K. Weld Join, 2005; (11): 27
(李少兵, 张俊旭, 朱炳坤. 焊接, 2005; (11): 27)
[16] Essouni M, Beaven P A. Mater Sci Eng, 1990; S130: 173
[17] Hehemann A F, Kinsman K, Aaronson H I. Metall Trans, 1972; 5: 1077
[18] Yi H L, Ma Q S, Du L X, Lin X H, Wang G D. Mater Mech Eng, 2009; 33(6): 37
(衣海龙, 麻庆申, 杜林秀, 刘相华, 王国栋. 机械工程学报, 2009; 33(6): 37)
[19] Song W X. Metallography. Beijing: Metallurgy Industry Press, 2008: 374
(宋微锡. 金属学. 北京: 冶金工业出版社, 2008: 374)
[20] Gao X L, Fu G Q, Deng Z Y, Lin G M, Zhu M Y. Chin JProcess Eng, 2010; 10: 998
(高新亮, 付贵勤, 邓志银, 林光铭, 朱苗勇. 过程工程学报, 2010; 10: 998)
[21] Onck P R, Andrews E W, Gibson L J. Int J Mech Sci, 2001; 43: 681
[22] Zhang Y Q, Zhang R J, Su H, Li L. Iron Steel, 2003; 38: 45
(张永权, 张荣久, 苏航, 李丽. 钢铁, 2003; 38: 45)
[23] Hwang B, Kin Y G, Lee S, Kim Y M, Kim N J, Yoo J Y. Metall Mater Trans, 2005; 36A: 2107
[24] Zhao L, Zhang X D, Chen W Z. Acta Metall Sin, 2005; 41: 392
(赵 琳, 张旭东, 陈武柱. 金属学报, 2005; 41: 392)
[25] Bonnevie E, Ferri`ere G, Ikhlef A. Mater Sci Eng, 2004; A385: 352
[26] Davis C L, King J E. Mater Sci Technol, 1993; 9: 8
[27] Ju D C, Zhu P X, Yan H C, Liu J Q. Metall Collect, 2008; (2): 41
(居殿春, 竺培显, 颜慧成, 刘家琪. 冶金丛刊, 2008; (2): 41)
[28] Cui Z Q. Metallography and Heat Treatment. Beijing: China Machine Press, 1999: 39
(崔忠圻. 金属学与热处理. 北京: 机械工业出版社, 1999: 39)
[29] Fang H S, Wang J J, Yang Z G, Li C M, Bo X Z, Zheng Y K. Bainite Transformation. Beijing: Science Press, 1999: 370
(方鸿生, 王家军, 杨志刚, 李春明, 薄详正, 郑燕康. 贝氏体相变.北京: 科学出版社, 1999: 370)
[30] Xu Z, Zhao L C. Transformation Theory of Metal in Solid. Beijing: Science Press, 2004: 120
(徐 洲, 赵连城. 金属固态相变原理. 北京: 科学出版社, 2004: 120)
[31] Diazfuentes M, Izamendia A, Gutierrez I. Metall Mater Trans, 2003; 34A: 2005
[32] Sa S Y, Wang P. Chin J Nonferrous Met, 2010; 20(Spec.): 429
(撒世勇, 王平. 中国有色金属学报, 2010; 20(特刊): 429)
/
| 〈 |
|
〉 |
