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

IMR OpenIR

	Hot Deformation Behavior of an Ultra-High-Strength Fe–Ni–Co-Based Maraging Steel
其他题名	Hot 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
发表期刊	Acta Metallurgica Sinica(English Letters)
ISSN	1006-7191
卷号	32 期号:9 页码:1161-1172
摘要	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.
其他摘要	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.
关键词	Maraging steel Hot working Dynamic recrystallization Constitutive equation Hot processing map
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:6563720
引用统计	被引频次：6[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/156992
专题	中国科学院金属研究所
作者单位	中国科学院金属研究所
推荐引用方式 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.