EFFECT OF HOMOGENIZATION TREATMENT ON THE HOT DEFORMATION OF GH742 ALLOY
Received date: 2012-05-03
Revised date: 2012-07-19
Online published: 2012-11-11
As the increases of alloying elements, the highly alloyed Ni-based superalloys are very difficult to deform due to the low deformation plasticity, high flow stress and narrow deformation temperature interval. The hot deformation behavior of highly alloyed as-cast and homogenization treated GH742 alloys was investigated by isothermal compression conducted on a Gleeble-3500 thermo-simulation machine. The ingots were homogenization treated at 1140 ℃ for 6 h or at 1100 ℃ for 30 h and at 1160 ℃ for 40 h, followed by furnace cooling to 800 ℃ and then air cooling to room temperarue. The GH742 alloys possess lower flow stress, higher plasticity and larger recrystallization degree as the homogenization degree increases during the deformation process. High dislocation density and deformation bands are formed due to the elemental segregation and the precipitates of γ' and δ phase in the interdendritic regions, which enhance the flow stress. Mircocracks are initiated when the brittle precipitates such as Laves phase and Ni5Ce phase are crushed by compression. Stress concentration area as well as the banded structure of carbides is formed when the primary MC type carbides are deformed. The two-step homogenization treatment via low temperature pretreatment followed by high temperature diffusion presented by this paper can not only eliminate the elemental segregation and the detrimental precipitates, but also improve the dimension and distribution of MC type carbides, which decreases the flow stress, increases the hot deformation plasticity remarkably, and obtains homogeneously recrystallized microstructure.
PAN Xiaolin WANG Bo SUN Wenru TU Ganfeng GUO Shouren HU Zhuangqi . EFFECT OF HOMOGENIZATION TREATMENT ON THE HOT DEFORMATION OF GH742 ALLOY[J]. Acta Metall Sin, 2012 , 48(11) : 1403 -1408 . DOI: 10.3724/SP.J.1037.2012.00250
[1] Yuan Y, Gu Y F, Osada T, Zhong Z H, Yokokawa T, Harada H. Scr Mater, 2012; 67: 137
[2] Xie G, Wang L, Zhang J, Lou L H. Scr Mater, 2012; 66: 378
[3] Ning Y Q, Yao Z K, Fu M W, Guo H Z. Mater Sci Eng, 2011; A528: 8065
[4] Wu K, Liu G Q, Hu B F, Li F, Zhang YW, Tao Y, Liu J T. Mater Charact, 2010; 61: 330
[5] Li D F, Guo Q M, Guo S L, Peng H J, Wu Z G. Mater Des, 2011; 32: 696
[6] Zhong Z Y, Zhuang J Y. J Iron Steel Res, 2003; 15: 1
(仲增墉, 庄景云. 钢铁研究学报, 2003; 15: 1)
[7] Qu J L, Bi Z N, Du J H, Wang M Q, Wang Q Z, Zhang J. J Iron Steel Res, 2011; 18: 59
[8] Zhang B J, Zhao G P, Xu G H, Feng D. Acta Metall Sin, 2005; 41: 1207
(张北江, 赵光普, 胥国华, 冯涤. 金属学报, 2005; 41: 1207)
[9] Lu X D, Du J H, Deng Q, Zhong Z Y. J Alloys Compd, 2009; 486: 195
[10] Long Z D, Zhuang J Y, Deng B, Zhong Z Y. Acta Metall Sin, 1999; 35: 1211
(龙正东, 庄景云, 邓波, 仲增墉. 金属学报, 1999; 35: 1211)
[11] Zheng L, Gu C Q, Zheng Y R. Scr Mater, 2004; 50: 435
[12] Gizan X R, Liu E Z, Zheng Z, Yu Y S, Tong J, Zhai Y C. J Mater Sci Technol, 2011; 27: 113
[13] Wang K, Si H, Yang C, Xu T D. J Iron Steel Res Int, 2011; 18: 61
[14] Dupont J N, Robino C V, Michael J R, Notis M R, Marder A R. Metall Mater Trans, 1998; 29A: 2785
[15] Pan X L, Yu H Y, Tu G F, Sun W R, Hu Z Q. Trans Nonferrous Met Soc China, 2011; 21: 2402
[16] Semiatin S L, Kramb R C, Turner R E, Zhang F, Antony M M. Scr Mater, 2004; 51: 491
[17] Wang L, Pyczak F, Zhang J, Lou L H, Singer R F. Mater Sci Eng, 2011; A532: 487
[18] Kramb R C, Antony M M, Semiatin S L. Scr Mater, 2006; 54: 1645
[19] Pan X L, Sun W R, Li Z, Yang S L, Guo S R, Yang H C, Hu Z Q. Rare Met Mater Eng, 2010; 39: 55
(潘晓林, 孙文儒, 李 战, 杨树林, 郭守仁, 杨洪才, 胡壮麒. 稀有金属材料与工程, 2010; 39: 55)
[20] Pan X L, Yu H Y, Tu G F, SunWR, Hu Z Q. Mater Sci Technol, 2012; 28: 560
[21] Pan X L, Sun W R, Yang S L, Li Z, Guo S R, Yang H C, Hu Z Q. Chin J Mater Res, 2008; 22: 651
(潘晓林, 孙文儒, 杨树林, 李 战, 郭守仁, 杨洪才, 胡壮麒. 材料研究学报, 2008; 22: 651)
[22] Gottstein G, Deshpande S. Mater Sci Eng, 1987; 94: 147
[23] Wang Y, Shao W Z, Zhen L, Zhang B Y. Mater Sci Eng, 2011; A528: 3218
[24] Ning Y Q, Yao Z K, Liang X M, Liu Y H. Mater Sci Eng, 2012; A551: 7
[25] Wang K, Li M Q, Luo J, Li C. Mater Sci Eng, 2011; A528: 4723
/
| 〈 |
|
〉 |
