Verification of Interpretation of Dynamic Strain Aging for Intermediate Temperature Embrittlement in Ni-Bi Alloy

Wu-qiang YANG,,Min XU,Ye MENG,Lei ZHENG,Xiao-dong MENG

钢铁研究学报(英文版) ›› 2015, Vol. 22 ›› Issue (7) : 602-606.

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钢铁研究学报(英文版) ›› 2015, Vol. 22 ›› Issue (7) : 602-606.
Metallurgy and Metal Working

Verification of Interpretation of Dynamic Strain Aging for Intermediate Temperature Embrittlement in Ni-Bi Alloy

  • Wu-qiang YANG1,2,Min XU1,Ye MENG1,Lei ZHENG1,Xiao-dong MENG2
作者信息 +

Verification of Interpretation of Dynamic Strain Aging for Intermediate Temperature Embrittlement in Ni-Bi Alloy

  • Wu-qiang YANG1,2,Min XU1,Ye MENG1,Lei ZHENG1,Xiao-dong MENG2
Author information +
文章历史 +

摘要

Intermediate temperature embrittlement (ITE) is a general phenomenon in Ni alloys and recently was interpreted by dynamic strain aging (DSA). The relationship between ITE and DSA was studied by a binary Ni-Bi alloy. The experimental alloy of well-controlled purity was produced by vacuum induction melting and then heat-treated properly. Tensile tests were performed at various tensile temperatures, and the elongation at fracture was used to indicate the ductility. In order to identify the mechanisms of fracture and ITE, fracture morphologies of the samples of low ductility were observed by scanning electron microscopy. According to the tensile ductility, Ni-Bi alloy shows an obvious embrittlement behavior in the intermediate temperature range (700-750 ℃). However, the stress-strain curves of Ni-Bi alloy and the fracture morphologies indicate that DSA does not exist over the whole temperature range. Based on the experimental results and literatures, the interpretation of DSA was then discussed and proved to be invalid for elucidating the general feature of ITE in Ni-Bi alloy and Ni-based superalloys.

Abstract

Intermediate temperature embrittlement (ITE) is a general phenomenon in Ni alloys and recently was interpreted by dynamic strain aging (DSA). The relationship between ITE and DSA was studied by a binary Ni-Bi alloy. The experimental alloy of well-controlled purity was produced by vacuum induction melting and then heat-treated properly. Tensile tests were performed at various tensile temperatures, and the elongation at fracture was used to indicate the ductility. In order to identify the mechanisms of fracture and ITE, fracture morphologies of the samples of low ductility were observed by scanning electron microscopy. According to the tensile ductility, Ni-Bi alloy shows an obvious embrittlement behavior in the intermediate temperature range (700-750 ℃). However, the stress-strain curves of Ni-Bi alloy and the fracture morphologies indicate that DSA does not exist over the whole temperature range. Based on the experimental results and literatures, the interpretation of DSA was then discussed and proved to be invalid for elucidating the general feature of ITE in Ni-Bi alloy and Ni-based superalloys.

关键词

Intermediate temperature embrittlement / Ni-Bi alloy / dynamic strain aging / stress–strain curve

Key words

Intermediate temperature embrittlement / Ni-Bi alloy / dynamic strain aging / stress–strain curve

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郑磊, 杨武强, 徐敏, . Verification of Interpretation of Dynamic Strain Aging for Intermediate Temperature Embrittlement in Ni-Bi Alloy[J]. 钢铁研究学报(英文版), 2015, 22(7): 602-606
ZHENG Lei, YANG Wu-Jiang, XU Min, et al. Verification of Interpretation of Dynamic Strain Aging for Intermediate Temperature Embrittlement in Ni-Bi Alloy[J]. Journal of Iron and Steel Research International, 2015, 22(7): 602-606

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基金

National Natural Science Foundation of China;Fok Ying Tong Education Foundation;Fundamental Research Funds for the Central Universities

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