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Hot Deformation Behavior of an Ultra-High-Strength Fe–Ni–Co-Based Maraging Steel

Zhang Le ^1,2 Wang Wei ^1,3 Babar Shahzad M ¹ Shan Yiyin ^1,3 Yang Ke ¹

文摘	Hot 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.
来源	Acta Metallurgica Sinica(English Letters) ,2019,32(9):1161-1172 【核心库】
DOI	10.1007/s40195-019-00913-3
关键词	Maraging steel ; Hot working ; Dynamic recrystallization ; Constitutive equation ; Hot processing map
地址	1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016 2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026 3. Institute of Metal Research, Chinese Academy of Sciences, Key Laboratory of Nuclear Materials and Safety Assessment, Chinese Academy of Sciences, Shenyang, 110016
语种	英文
文献类型	研究性论文
ISSN	1006-7191
学科	金属学与金属工艺
基金	sponsored by the Youth Innovation Promotion Association of Chinese Academy of Sciences ; 国家自然科学基金 ; the Innovation Project of Institute of Metal Research ; the National Natural Science Foundation of China Research Fund for International Young Scientists
文献收藏号	CSCD:6563720

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