Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第20卷    第7期    总第136期    2010年7月

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文章编号:1004-0609(2010)07-1321-07
GH625镍基合金的高温压缩变形行为及组织演变
吾志岗,李德富

(北京有色金属研究总院, 北京 100088)

摘 要: 在Gleeble−1500D热模拟机上采用等温压缩实验研究GH625合金的高温压缩变形行为,获得合金在温度为1 000~1 200 ℃、应变速率为10−2~10 s−1的条件下的真应力—应变曲线,并在考虑摩擦和变形热效应的基础上对真应力—应变曲线进行修正。对修正后的峰值应力进行线性回归,得到合金的高温材料常数:Q=635.38 kJ/mol, α=0.008 404 MPa−1, n=3.52。通过非线性回归建立GH625合金包含应变量的高温变形本构模型。在应变速率为0.1 s−1时,随着热变形温度的升高,合金发生动态再结晶的体积分数随之增加,在1 000~1 100 ℃发生部分动态再结晶,当温度达到1 200 ℃时,发生完全动态再结晶,此时平均晶粒尺寸约为22.21 μm。

 

关键字: GH625合金; 流变行为; 变形热; 本构模型; 动态再结晶

Hot compression deformation behaviors and
microstructure evolution of GH625 Ni-based alloy
WU Zhi-gang, LI De-fu

Beijing General Research Institute for Non-ferrous Metals, Beijing 100088, China

Abstract:The hot deformation behaviors of GH625 nickel-based alloy were investigated by hot compression tests with Gleeble−1500D simulated machine. The true stress—true strain curves in the temperature range of 1 000−1 200 ℃ and strain rate of 102−10 s1 were obtained. The true stain—stress curves were corrected in consideration of the friction and deformation. The material constants, the activation energy (Q) of 635.38 kJ/mol, α of 0.008 404 MPa1, and n of 3.52, of high-temperature deformation for GH625 were obtained by the linear regression of peak stress. The constitutive equation of GH625 alloy containing the strain was established through non-linear regression. When the strain rate is 0.1 s−1, the volume fraction of dynamic recrystallization increases with increasing the temperature. The results show that partial dynamic recrystallization can be received when the temperature ranges from 1 000 ℃ to 1 100 ℃, and fully dynamic recrystallized structure can be received when the temperature reaches 1 200 ℃. And the average dynamically recrystallized grain size is about 22.21 μm.

 

Key words: GH625 alloy; flow behavior; deformation heat; constitutive equation; dynamic recrystallization

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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