均匀化过程中铸态GH742合金的组织转变

材料研究学报

2008, Vol. 22

Issue (6): 651-656

研究论文

本期目录 | 过刊浏览

均匀化过程中铸态GH742合金的组织转变

潘晓林^1;2;孙文儒^2†;杨树林²;李战³;郭守仁²;杨洪才¹;胡壮麒²

1.东北大学材料与冶金学院沈阳 110004
2.中国科学院金属研究所沈阳 110016
3.沈阳理工大学沈阳 110168

Microstructure transformation during homogenization treatment in as-cast GH742 alloy

PAN Xiaolin^1;2; SUN Wenru^2†; YANG Shulin²; LI Zhan³; GUO ShouRen²; YANG Hongcai¹; HU Zhuangqi²

1.School of Material & Metallurgy; Northeastern University; Shenyang 110004
2.Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
3.Shenyang University of Science & Technology; Shenyang 110168

引用本文:

潘晓林孙文儒杨树林李战郭守仁杨洪才胡壮麒. 均匀化过程中铸态GH742合金的组织转变[J]. 材料研究学报, 2008, 22(6): 651-656.
, , , , , , . Microstructure transformation during homogenization treatment in as-cast GH742 alloy[J]. Chin J Mater Res, 2008, 22(6): 651-656.

全文: PDF(1250 KB)

摘要:

铸态GH742合金中存在复杂的第二相组织和严重的枝晶偏析,Nb、Ti大量富集于枝晶间和MC碳化物、 Laves相、δ相、(γ+γ´)等析出相中.本文确定了γ基体的熔化温度为1160℃,并通过不同的均匀化处理确定了γ´相、(γ+γ´)共晶、MC碳化物、Laves相、δ相、Ni₅Ce相及含氧硫稀土相等析出相的溶解温度.由于稀土相在1120℃发生熔化,提出一种GH742合金低温预处理加高温扩散的二次均匀化制度来扩大其均匀化温度区间,提高扩散退火温度, 从而获得均一的组织. 元素扩散计算结果表明,提高均匀化温度可以提高元素的扩散系数; Nb的偏析系数比Ti的小得多,达到完全均匀化需要很长的时间.

关键词 ：金属材料, 镍基高温合金, 均匀化, 组织转变, 偏析, 扩散

Abstract：

The precipitation of as-cast GH742 alloy is complicated and the dendritic segregation is severe. Niobium and titanium are segregated to the interdendritic region and enriched in the precipitates such as MC carbide, Laves phase, δ phase, (γ+γ´) eutectic. The melting temperature of as-cast GH742 alloy is 1160 determined by differential thermal analysis and metallography, while the soluble temperatures of γ´ phase,(γ+γ´)eutectic, MC carbide, Laves phase, δ phase, Ni5Ce phase and RE-O-S phase were determined by different homogenization treatments. In order to obtain uniform austenitic microstructure, a two-step homogenization treatment via low temperature pretreatment followed by high temperature diffusion is established due to the melting of RE-O-S phase at 1120 , which broadens the window of the homogenization temperature and increases the annealing temperature. The diffusion coefficient of niobium is much smaller than that of titanium, which requires more time to be absolutely homogenized.

Key words： metallic materials Ni-base superalloy homogenization microstructure transformation segregation diffusion

收稿日期: 2008-01-28

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https://www.cjmr.org/CN/ 或 https://www.cjmr.org/CN/Y2008/V22/I6/651

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