Modeling of the Hot Deformation of Cast Super Duplex Corrosion-Resistant Steel

IF 0.4 Q4 METALLURGY & METALLURGICAL ENGINEERING
S. V. Rushchits, N. A. Shaburova, V. V. Sedukhin, A. M. Akhmed’yanov, S. P. Samoilov, A. N. Anikeev, I. V. Chumanov
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Abstract

The deformation behavior of cast super duplex steel is studied in the temperature range 1100–1250°C and the strain rate range 0.1–10 s–1. Hot deformation is performed by uniaxial compression of cylindrical specimens on a Gleeble 3800 simulator of thermomechanical processes. The flow stresses are shown to decrease with increasing temperature and decreasing strain rate in accordance with a change in the Zener–Hollomon parameter of the temperature–rate deformation conditions. The shape of the flow curves indicates that hot deformation is accompanied by intense dynamic softening, as a result of which the flow stresses decrease or remain unchanged after reaching peak values. Under all hot deformation conditions, ferrite acquires a dynamically recrystallized structure. At the lowest deformation temperature (1100°C) and relatively high strain rates (1–10 s–1), the mechanism of austenite softening is dynamic recovery. A decrease in the strain rate or an increase in the deformation temperature causes partial dynamic recrystallization of austenite. Under similar deformation conditions, the plastic flow stress of the steel under study is significantly higher than that in standard duplex stainless steels. When analyzing the peak flow stresses, we determined the effective hot deformation activation energy (Q = 501.31 kJ/mol) required for calculating the Zener–Hollomon parameter. An expression for describing the peak flow stress is obtained in the form of a hyperbolic function of the Zener–Hollomon parameter. This expression describes the experimental data array with a high accuracy and can be used to estimate the required energy–force parameters of forging and rolling equipment. A comparative estimation of the hot ductility of the super duplex steel is performed by finding the strain corresponding to the appearance of the first macrocracks on the specimen surface. At a strain rate of 10 s–1 (which is characteristic of hot forging processes), the safest deformation temperature range of the steel is shown to be 1150–1250°C, in which austenite undergoes partial dynamic recrystallization reducing the risks of cracking.

Abstract Image

铸造超级双相耐腐蚀钢的热变形建模
研究了铸造超级双相钢在温度范围 1100-1250°C 和应变速率范围 0.1-10 s-1 下的变形行为。热变形是通过在 Gleeble 3800 热机械过程模拟器上对圆柱形试样进行单轴压缩来实现的。结果表明,随着温度的升高和应变速率的减小,流动应力随温度-速率变形条件下齐纳-霍洛蒙参数的变化而减小。流动曲线的形状表明,热变形伴随着强烈的动态软化,因此流动应力在达到峰值后会降低或保持不变。在所有热变形条件下,铁素体都获得了动态再结晶结构。在最低变形温度(1100°C)和相对较高的应变速率(1-10 s-1)下,奥氏体软化的机制是动态恢复。应变速率的降低或变形温度的升高会导致奥氏体部分动态再结晶。在类似的变形条件下,所研究钢材的塑性流动应力明显高于标准双相不锈钢。在分析峰值流动应力时,我们确定了计算齐纳-霍洛蒙参数所需的有效热变形活化能(Q = 501.31 kJ/mol)。以齐纳-霍洛蒙参数的双曲线函数形式得到了描述峰值流动应力的表达式。该表达式对实验数据阵列进行了高精度描述,可用于估算锻造和轧制设备所需的能量-力参数。通过找出试样表面出现第一条大裂纹时的相应应变,对超级双相钢的热延展性进行了比较估算。在应变速率为 10 s-1 时(这是热锻工艺的特征),钢的最安全变形温度范围为 1150-1250°C,在此温度范围内奥氏体会发生部分动态再结晶,从而降低开裂风险。
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来源期刊
Russian Metallurgy (Metally)
Russian Metallurgy (Metally) METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
0.70
自引率
25.00%
发文量
140
期刊介绍: Russian Metallurgy (Metally)  publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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