Effect of ECAP at Room Temperature on Microstructure and Properties of T250 Maraging Steel

The microstructure changes of T250 maraging steel during equal channel angular precessing (ECAP) were studied, and the change of hardness with aging time was analyzed. T250 maraging steel was deformed by route C ECAP process 2 deformation at room temperature. And then, as-received samples and ECAP s...

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Published inHang kong cai liao xue bao Vol. 34; no. 6; pp. 28 - 32
Main Authors Xie, Dong, Yang, Xi-Rong, Zhao, Xi-Cheng, Xi, Sha
Format Journal Article
LanguageChinese
Published 01.12.2014
Subjects
Aging (metallurgy)
Aging aircraft
Deformation
Equal channel angular pressing
Hardness
Maraging steels
Microstructure
Planes
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Summary:The microstructure changes of T250 maraging steel during equal channel angular precessing (ECAP) were studied, and the change of hardness with aging time was analyzed. T250 maraging steel was deformed by route C ECAP process 2 deformation at room temperature. And then, as-received samples and ECAP samples were aged at 480 degree C for 15-480min. The results show that with the increase of ECAP pass, the microstructure of x plane changes from a more uniform neat lath into a more curved messy one. Then the subgrains and the dislocation cells appear in the lath. The change of y plane is refinement of martensite laths, and the microstructure of z plane is not changed. The hardness of T250 maraging steel is gradually increased with the increase of passes, and the increasing percentage of hardness by aging treatment is declined, meanwhile the time to maxmize hardness is shortened.
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ISSN:1005-5053
DOI:10.11868/j.issn.1005-5053.2014.6.003