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熱處理對粉末高溫合金不均勻變形的改善作用
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Improvement of Forging Heat Treatment on Inhomogeneous Deformation of P/M Superalloy
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    摘要:

    粉末高溫合金因合金化程度高、可鍛性差，在鍛造加工過程中容易發(fā)生不均勻變形和開裂。利用OM、SEM和TEM分析粉末高溫合金易產生不均勻變形的組織原因，初步探索了退火處理對改善組織，提高可鍛性的原因。結果表明：由于晶粒轉動和第二相不均勻分布引起的微觀不均勻變形是導致宏觀不均勻變形的直接原因；經鍛前多臺階熱處理后，三晶粒交界處生成細小等軸晶層，第二相彌散分布均有利于粉末高溫合金變形。

    Abstract:

    Inhomogeneous deformation and cracking could easily appear during forging for powder metallurgy (P/M for short) superalloy. OM, SEM and TEM were employed to find the reasons of inhomogeneous deformation. The action of annealing on improving the microstructure and malleability was explored preliminarily. The results indicate that inhomogeneous microscopic deformation caused by grains turn and non-uniform secondary particles can lead to inhomogeneous deformation. Through the multistage annealing before forging, equiaxed fine grain layer appeared in the junction of three grains and made secondary particles disperse, which is attributed to homogeneous deformation of P/M superalloy.

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雷應毅,姚澤坤,寧永權,謝興華,郭鴻鎮(zhèn),陶 宇.熱處理對粉末高溫合金不均勻變形的改善作用[J].稀有金屬材料與工程,2012,41(9):1689~1692.[Lei Yingyi, Yao Zekun, Ning Yongquan, Xie Xinghua, Guo Hongzhen, Tao Yu. Improvement of Forging Heat Treatment on Inhomogeneous Deformation of P/M Superalloy[J]. Rare Metal Materials and Engineering,2012,41(9):1689~1692.]
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  • 收稿日期:2011-09-10
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