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Effects of Yttrium on Microstructure Stability and Tensile Properties of China Low Activation Martensitic Steel

Authors :
Guoxing Qiu
Dongping Zhan
Changsheng Li
Min Qi
Yongkun Yang
Zhouhua Jiang
Huishu Zhang
Source :
Metals, Vol 9, Iss 4, p 446 (2019)
Publication Year :
2019
Publisher :
MDPI AG, 2019.

Abstract

This study investigated the microstructural stability and mechanical properties exhibited by China low activation martensitic (CLAM) steels with different yttrium (Y) contents over 3000 h of aging at 550 °C. Scanning electron microscopy, electron backscatter diffraction analysis, and transmission electron microscopy were employed to investigate the microstructural evolution of the steels. Results indicated that grain boundary migration was slow and the Laves phase precipitation was delayed in Y-containing steels. Grain boundaries at different angles in 0Y and 6Y CLAM steels were significantly affected, and those in 36Y and 71Y alloys exhibited negligible changes during the long-term thermal aging. Moreover, Y contents had appreciable effects on the strength and toughness of the aged steels. The stable microstructure of Y-containing CLAM alloys is responsible for improved strength and impact toughness during aging.

Details

Language :
English
ISSN :
20754701
Volume :
9
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Metals
Publication Type :
Academic Journal
Accession number :
edsdoj.0d3ef45b64f64e3ca4ae78247fd254b0
Document Type :
article
Full Text :
https://doi.org/10.3390/met9040446