研究了不同固溶温度热处理对氮气雾化喷射成形GH742y合金相组成和晶粒尺寸的影响,并重点分析了第二相对晶粒长大的抑制作用。结果表明:氮气雾化喷射成形GH742y合金具有良好的高温抗晶粒长大特性,极限晶粒尺寸约为40μm;γ′相固溶温度约为1127℃;高于γ′相固溶温度热处理时,弥散分布MC型碳氮化合物阻碍晶粒长大;Gladman方程可以估计氮气雾化沉积坯的极限晶粒尺寸。
Abstract
The influence of solution temperature on the phase structure and grain size of spray forming GH742y N2-atomized has been investigated,and,the inhibited effects of the second phase on grain growth have also been studied.The results indicate very little coarsening and good stability of grains in GH742y alloy spray formed by nitrogen atomization.The limiting ultimate grain size of the as spray formed and HIPed alloy was about 40μm.The γ′ solvus temperature of spray formed GH742y has determined to be about 1127℃.The dispersed MC-type carbonitrides inhibit grain coarsening during solution treatment above γ′ solvus temperature.Gladman equation can estimate limiting ultimate grain size in HIPed preform N2 atomized.
关键词
喷射成形 /
晶粒长大 /
GH742y /
碳氮化合物
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Key words
spray forming /
grain growth /
GH742y /
carbonitride
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参考文献
ZHANG G,LI Z,TIAN S,et al.Spray Forming and Thermal Processing for High Performance Superalloys[J] ,Materials Science Forum,2004,475～479:2773-2778.
李周,袁华,张国庆,等.喷射成形GH742y合金的组织和性能[J].钢铁研究学报,2003,15(7):679-682.
毛卫民,赵新兵.金属的再结晶与晶粒长大[M].北京:冶金工业出版社,1994.
阮中慈.图像分析仪定量分析中测量参数的选择[J].材料工程,1995,(6):38-39.
胡汉起,金属凝固原理(第2版)[M].北京:机械工业出版社,2000
余永宁.金属学原理[M].北京:冶金工业出版社,2000.
MURALIDHARAN G,THOMPSON R G.Effect of second phase precipitation on limiting grain growth in alloy 718[J].Scripta Materialia,1997,36 (7):755-761.
宋晓艳.晶粒长大与显微组织的Monte Carlo仿真研究[D].北京:北京科技大学,1998
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脚注
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基金
航空科学基金(03H21002)
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