The Effect of Cold Working on Creep Rupture Strength and Microstructure of Ni-23Cr-7W Alloy

Shioda, Yoshiki and Kubushiro, Keiji and Sakakibara, Youhei and Nomura, Kyohei and Murata, Yoshinori (2017) The Effect of Cold Working on Creep Rupture Strength and Microstructure of Ni-23Cr-7W Alloy. World Journal of Mechanics, 07 (10). pp. 283-295. ISSN 2160-049X

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Abstract

In order to clarify the reason why the creep rupture time of pre-strained Ni-23Cr-7W Alloy (HR6W) is longer than that of the non-pre-strained HR6W, microstructures of HR6W after a series of creep tests were investigated. The creep tests were conducted at 750°C, 90 and 100 MPa. In the pre-strained samples, the grain boundary shielding ratio by precipitates was larger than that of the non-pre-strained sample. In addition, in the pre-strained samples the size of the M23C6 carbide in the grains was finer than in the non-pre-strained sample. The W content in the M23C6 carbide in the pre-strained samples tended to be larger than in the non-pre-strained sample. Therefore, the Ostwald ripening of the carbide was delayed and the size of M23C6 carbide was thought to be fine for a long time. These observations show that creep strength in the pre-strained samples is higher than that of the non-pre-strained sample because of both precipitation strengthening inside of the grains and grain boundaries.

Item Type: Article
Subjects: Science Global Plos > Engineering
Depositing User: Unnamed user with email support@science.globalplos.com
Date Deposited: 23 Feb 2023 11:40
Last Modified: 30 Dec 2023 13:32
URI: http://ebooks.manu2sent.com/id/eprint/126

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