Room temperature creep characteristics of a high strength steel with extremely high yield ratio

doi:10.13251/j.issn.0254-6051.2020.03.006

Abstract

Abstract:

The room temperature creep behavior of a high strength steel with yield ratio of 99.7% under different loading stress conditions was studied by using MTS universal testing machine, and the characteristics of microstructure evolution under different creep conditions were analyzed. The results show that under the loading stress lower than the yielding strength, the tested steel shows obvious creep phenomenon at room temperature, and the creep curve shows typical two-stage room temperature creep characteristics based on steady state stage. From the fitting results of the creep curves, it can be found that the curves follow the log law, and the creep rate decreases gradually with the increase of creep time, which may vary by two orders of magnitude. Under different room temperature creep conditions, the change of microstructure of the high strength steel is not obvious in the process of room temperature creep. The grain sizes are very small and most of them are less than 5 μm. Besides, the grain boundary is dominated by the small angular grain boundary below 15°, while the large angle grain boundary is mostly concentrated in the 50°-60° range.

Key words: high strength steel, yield ratio, room temperature creep, microstructure, creep rate

CLC Number:

TG142.1

Guo Miao, Ding Xinming, Ning Yanting, Sun Wei. Room temperature creep characteristics of a high strength steel with extremely high yield ratio[J]. HTM, 2020, 45(3): 25-29.

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