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Microstructures and Mechanical Properties of a Newly Developed Austenitic Heat Resistant Steel
Liu, Peng; Chu, Zhao-Kuang; Yuan, Yong; Wang, Dao-Hong; Cui, Chuan-Yong; Hou, Gui-Chen; Zhou, Yi-Zhou; Sun, Xiao-Feng
2019-04-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume32Issue:4Pages:517-525
AbstractThe effect of heat treatment on the microstructures and mechanical properties of a newly developed austenitic heat resistant steel (named as T8 alloy) for ultra-supercritical applications have been studied. Results show that the main phases in the alloy after solution treatment are and primary MX. Subsequent aging treatment causes the precipitation of M23C6 carbides along the grain boundaries and a small number of nanoscale MX inside the grains. In addition, with increasing the aging temperature and time, the morphology of M23C6 carbides changes from semi-continuous chain to continuous network. Compared with a commercial HR3C alloy, T8 alloy has comparable tensile strength, but higher stress rupture strength. The dominant cracking mechanism of the alloy during tensile test at room temperature is transgranular, while at high temperature, intergranular cracking becomes the main cracking mode, which may be caused by the precipitation of continuous M23C6 carbides along the grain boundaries. Typical intergranular cracking is the dominant cracking mode of the alloy at all stress rupture tests.
KeywordAustenitic heat resistant steel Microstructure Mechanical property Fracture mode
Indexed BySCI
Language英语
WOS IDWOS:000461434000011
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81228
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Liu, Peng,Chu, Zhao-Kuang,Yuan, Yong,et al. Microstructures and Mechanical Properties of a Newly Developed Austenitic Heat Resistant Steel[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2019,32(4):517-525.
APA Liu, Peng.,Chu, Zhao-Kuang.,Yuan, Yong.,Wang, Dao-Hong.,Cui, Chuan-Yong.,...&Sun, Xiao-Feng.(2019).Microstructures and Mechanical Properties of a Newly Developed Austenitic Heat Resistant Steel.ACTA METALLURGICA SINICA-ENGLISH LETTERS,32(4),517-525.
MLA Liu, Peng,et al."Microstructures and Mechanical Properties of a Newly Developed Austenitic Heat Resistant Steel".ACTA METALLURGICA SINICA-ENGLISH LETTERS 32.4(2019):517-525.
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