| 高温扩散热处理对Ni-24Fe-14Cr-8Mo镍基合金显微组织的影响 |
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| 引用本文： | 崔毅,张雲飞,吕达,韩彦光,史远. 高温扩散热处理对Ni-24Fe-14Cr-8Mo镍基合金显微组织的影响[J]. 特殊钢, 2020, 41(6): 72-76 |
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| 作者姓名： | 崔毅 张雲飞 吕达 韩彦光 史远 |
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| 作者单位： | 河钢集团钢研总院，石家庄050000 |
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| 摘 要： | 本文以50kg真空感应熔炼的镍基合金Ni-24Fe-14Cr-8Mo为实验材料,通过采取不同温度、不同时间的高温扩散热处理,结合光学显微镜、扫描电子显微镜、电子探针分析仪以及金相照片图像分析的手段,围绕温度和时间对合金组织中Laves相回溶以及元素偏析的影响开展研究。结果表明,合金枝晶间岛状低熔点金属间化合物Laves相的析出造成严重的元素偏析,Laves相初熔温度在1180～1200℃;在1180℃ 7～100 h扩散热处理时,Laves相体积分数随处理时间呈Vf=11.557 8exp（-0.143 2 t）的指数规律减小,在1180℃保温40 h以内Laves相不能完全回溶,而保温76 h以上则Laves相可以完全回溶,保温100 h可以进一步消除元素偏析。Ni-24Fe-14Cr-8Mo合金的高温扩散热处理温度不应高于Laves相初熔温度,采取1180℃保温100 h有效地减少Laves相比例以及元素偏析。
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| 收稿时间： | 2020-06-22 |
Influence of High Temperature Diffusion Heat Treatment on Microstructure of Ni-24Fe-14 Cr-8Mo Nickel Base Alloy |
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| Cui Yi,Zhang Yunfei,Lü Da,Han Yanguang,Shi Yuan. Influence of High Temperature Diffusion Heat Treatment on Microstructure of Ni-24Fe-14 Cr-8Mo Nickel Base Alloy[J]. Special Steel, 2020, 41(6): 72-76 |
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| Authors: | Cui Yi Zhang Yunfei Lü Da Han Yanguang Shi Yuan |
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| Affiliation: | HESTEEL GROUP Technology Research Institute, Shijiazhuang 050000 |
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| Abstract: | In this paper, the influence of high temperature diffusion heat treatment on Laves phase and elements segregation in 50 kg vacuum induction melted Ni-24Fe-14Cr-8Mo nickel base alloy is studied. The alloy is heat-treated at different temperatures for different times, and the microstructure and element distribution are investigated through Optical Microscope (OM), Scanning Electron Microscope (SEM) , Electron Probe Micro-Analyzer (EPMA) and Metallographic Processing (MP). Results indicate that island-shaped Laves phase obviously precipitates in the interdendritic area led to a serious elements segregation. The incipient temperature of Laves phase is at 1180 ~ 1200 ℃. When the alloy is soaked at 1180 ℃ for 7 ~ 100 h, the volume fraction of Laves phase kept decreases with diffusion treatment time in an exponential pattern with Vf = 11.557 8exp( -0.1432 t) ； Laves phase could not be totally dissolved in less than 40 h but almost disappeared after 76 h at 1180℃；elements segregation could be further improved after 100 h high temperature diffusion heat treated at 1180℃.It could be concluded that for Ni-24Fe-14Cr-8Mo alloy the high diffusion heat treatment temperature should not be higher than incipient temperature Laves phase, and a treatment at 1 180 °C for 100 h could effectively reduce Laves phase fraction and elements segregation. |
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