Hot deformation characteristics of a nitride strengthened martensitic heat resistant steel
Hot deformation characteristics of a nitride strengthened martensitic heat resistant steel
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氮化强化马氏体耐热钢的热变形特性
DOI：
10.1016/j.msea.2013.10.020
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发表时间：
2014-01-10
期刊：
影响因子：
6.4
通讯作者：
Yang, Ke
中科院分区：
文献类型：
--
作者：
Zhang, Wen-Feng;Li, Xiao-Li;Yang, Ke
采用含Arrhenius项的本构方程分析了一种氮化物强化马氏体耐热钢在900-1200 ℃温度范围和10（-3）~ 10 s（-1）应变速率范围内的热变形行为。在分析变形数据的基础上，将应力-应变曲线分为4个区域，依次代表4个过程：硬化、动态回复（DRV）、动态应变诱发相变（DSIT）和动态再结晶（DRX）。根据偏导数/θ和偏导数中的拐点（偏导数θ/偏导数σ）/偏导数σ曲线。一些拐点有其自身的含义。例如，偏导数θ/偏导数σ的最小值定位DRV的开始，并且其最大值指示DRX的开始。在ln（Z）小于40时，DRX的临界应变对ln（Z）敏感;在ln（Z）大于40时，DRX的临界应力对ln（Z）敏感。通过软化过程（DRV、DRX、MDRX和DSIT）分析了不同变形条件下的最终组织。(C)2013爱思唯尔有限公司版权所有。
Constitutive equations including an Arrhenius term have been applied to analyze the hot deformation behavior of a nitride-strengthened (NS) martensitic heat resistant steel in temperature range of 900-1200 degrees C and strain rate range of 10(-3)-10 s(-1). On the basis of analysis of the deformation data, the stress-strain curves up to the peak were divided into four regions, in sequence, representing four processes, namely hardening, dynamic recovery (DRV), dynamic strain induced transformation (DSIT), and dynamic recrystallization (DRX), according to the inflection points in partial derivative/theta and partial derivative(partial derivative theta/partial derivative sigma)/partial derivative sigma curves. Some of the inflection points have their own meanings. For examples, the minimum of partial derivative theta/partial derivative sigma locates the start of DRV and the maximum of it indicates the start of DRX. The results also showed that the critical strain of DRX was sensitive to ln(Z) below 40, while the critical stress of DRX was sensitive to it above 40. The final microstructures under different deformation conditions were analyzed in terms of softening processes including DRV, DRX, metadynamic crystallization (MDRX) and DSIT. (C) 2013 Elsevier B.V. All rights reserved.