Advanced Engineering Materials, volume 26, issue 15

Improved tensile strength and SCC resistance via non‐isothermal creep aging under a high stress level

Zhihao Yi 1
Guofu Xu 1, 2
Lei Tang 1, 2
Zhihao Zhao 1
Yuan Tang 1
Haoran Li 1
Ruohan Wang 1
Xiaoyan Peng 1, 2
2
 
Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education Changsha 410083 China
Publication typeJournal Article
Publication date2024-07-10
scimago Q1
SJR0.808
CiteScore5.7
Impact factor3.4
ISSN14381656, 15272648
Abstract

Compared with conventional isothermal creep aging, non‐isothermal creep aging does not involve a prolonged holding stage, but only has heating and cooling stages. During the non‐isothermal creep aging process, the precipitates nucleate and grow up in the early part of heating stage, resulting in fluctuations in creep rate and an increase in strength. The coarsening of precipitates in the later part of the heating stage, can lead to significantly increase of creep rate. Upon approaching the peak temperature, the dissolution of the precipitates occurs in conjunction with a partial coarsening of the remaining precipitates, causing a reduction in strength. However, the secondary precipitation during the cooling stage facilities a significant strength enhancement in a relatively shorter period. In contrast to the isothermal creep aging, the targeted non‐isothermal creep aging treatment gives an increase in ultimate strength while improves the stress corrosion cracking resistance. Moreover, the time required for non‐isothermal creep aging to obtain ultimate strength is only 13.9 % of that of the ICA treatment. A large amount of creep strain can be generated during the NICA process, which is equivalent to 630 % of that of creep age forming treatment.

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