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Hot Deformation Behavior of an Ultra-High-Strength Fe–Ni–Co-Based Maraging Steel
Alternative TitleHot Deformation Behavior of an Ultra-High-Strength Fe–Ni–Co-Based Maraging Steel
Zhang Le; Wang Wei; Babar Shahzad M; Shan Yiyin; Yang Ke
2019
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 °C and strain rate range of 0.001–10 s~(–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 θ–σ and – ?θ/?σ – σ 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 °C/0.001~(–1) s–1 and 1000–1100 °C/0.001–0.1 s~(–1), with the efficiency range of 20–40%. Owing to high Mo content in the experimental steel, high dynamic activation energy, Q = 439.311 kJ mol~(–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.
Other AbstractHot processing behavior of an ultra-high-strength Fe–Ni–Co-based maraging steel was studied in temperature range of 900–1200 °C and strain rate range of 0.001–10 s~(–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 θ–σ and – ?θ/?σ – σ 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 °C/0.001~(–1) s–1 and 1000–1100 °C/0.001–0.1 s~(–1), with the efficiency range of 20–40%. Owing to high Mo content in the experimental steel, high dynamic activation energy, Q = 439.311 kJ mol~(–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 ByCSCD
Language英语
CSCD IDCSCD:6563720
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/156992
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
Zhang Le,Wang Wei,Babar Shahzad M,等. 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,Babar Shahzad M,Shan Yiyin,&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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