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Hot Deformation Behavior of an Ultra-High-Strength Fe-Ni-Co-Based Maraging Steel
Zhang, Le; Wang, Wei; Shahzad, M. Babar; Shan, Yi-Yin; Yang, Ke
2019-09-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume32Issue:9Pages:1161-1172
AbstractHot processing behavior of an ultra-high-strength Fe-Ni-Co-based maraging steel was studied in temperature range of 900-1200 degrees C and strain rate range of 0.001-10s(-1). Deformation processing parameters and optimum hot working window were characterized via flow stress analysis, constitutive equation construction, hot processing map calculation and microstructure evolution, respectively. Critical strain value for dynamic recrystallization was determined through theoretical mathematical differential method: the inflection point of theta-sigma and -partial derivative theta/partial derivative sigma-sigma curves. It was found that the flow stress increased with the decrease in deformation temperature and increase in the strain rate. The power dissipation maps in the strain range of 0.1-0.6 were entirely similar with the tendency of contour lines which implied that strain had no strong effect on the dissipation maps. Nevertheless, the instability maps showed obvious strain sensitivity with increasing strain, which was ascribed to the flow localization and instability. The optimized hot processing window of the experimental steel was obtained as 1100-1200 degrees C/0.001-1s(-1) and 1000-1100 degrees C/0.001-0.1s(-1), with the efficiency range of 20-40%. Owing to high Mo content in the experimental steel, high dynamic activation energy, Q=439.311kJmol(-1), was achieved, indicating that dynamic recrystallization was difficult to occur in the hot deformation process, which was proved via microstructure analysis under different hot deformation conditions.
KeywordMaraging steel Hot working Dynamic recrystallization Constitutive equation Hot processing map
Indexed BySCI
Language英语
WOS IDWOS:000477005900011
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80800
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Zhang, Le,Wang, Wei,Shahzad, M. Babar,et al. Hot Deformation Behavior of an Ultra-High-Strength Fe-Ni-Co-Based Maraging Steel[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2019,32(9):1161-1172.
APA Zhang, Le,Wang, Wei,Shahzad, M. Babar,Shan, Yi-Yin,&Yang, Ke.(2019).Hot Deformation Behavior of an Ultra-High-Strength Fe-Ni-Co-Based Maraging Steel.ACTA METALLURGICA SINICA-ENGLISH LETTERS,32(9),1161-1172.
MLA Zhang, Le,et al."Hot Deformation Behavior of an Ultra-High-Strength Fe-Ni-Co-Based Maraging Steel".ACTA METALLURGICA SINICA-ENGLISH LETTERS 32.9(2019):1161-1172.
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