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首页> 外文期刊>Materials Science and Engineering >Processing maps for hot deformation of a high-Mn TWIP steel: A comparative study of various criteria based on dynamic materials model
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Processing maps for hot deformation of a high-Mn TWIP steel: A comparative study of various criteria based on dynamic materials model

机译：高锰TWIP钢热变形的加工图：基于动态材料模型的各种标准的比较研究

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摘要

The hot deformation behavior of a high-Mn twinning-induced plasticity (TWIP) steel was studied using processing maps over the temperature range of 900-1150 ℃ and strain rate range of 0.001-20 s~(-1) Both the strain rate sensitivity map and power dissipation map exhibited a peak domain in the temperature range of 950-1150 ℃ and strain rate range of 0.01-1 s~(-1) where dynamic recrystallization (DRX) was the primary restoration mechanism. DRX was also found to be dominant at higher strain rates where the values of strain rate sensitivity (m) and efficiency of power dissipation (η) were relatively low. Although the flow curves at higher strain rates did not show any well-defined peak stresses, both the work hardening analysis and microstructural observations indicated the occurrence of DRX. Two types of criteria based on the dynamic materials model (DMM), i.e., Gegel's and Alexander-Malas's stability criteria based on Lyapunov functions and Kumar-Prasad's, Murty-Rao's and Babu's instability criteria based on Ziegler's flow theory, were used to develop the instability maps. It was found that the instability maps based on Gegel's and Alexander-Malas's stability criteria (or based on Kumar-Prasad's, Murty-Rao's and Babu's instability criterion) were essentially similar. However, comparisons between the two types of DMM criteria suggested that the instability maps were quite different from each other. The instability criteria based on Ziegler's flow theory were found to be more reliable in predicting the occurrence of flow instabilities, which manifested as inhomogeneous flow and localized deformation bands.
机译：利用加工图在900-1150℃的温度范围和0.001-20 s〜（-1）的应变速率范围内研究了高锰双晶诱导塑性（TWIP）钢的热变形行为。应变速率敏感性功率图和功耗图在9500-1150℃的温度范围内表现出峰域，应变率范围为0.01-1 s〜（-1），其中动态重结晶（DRX）是主要的恢复机制。还发现在较高的应变速率下，DRX占主导地位，其中应变速率灵敏度（m）和功耗效率（η）的值相对较低。尽管在较高应变速率下的流动曲线未显示任何明确的峰值应力，但加工硬化分析和微观结构观察均表明发生了DRX。基于动态材料模型（DMM）的两种类型的准则，即基于Lyapunov函数的Gegel和Alexander-Malas的稳定性准则以及基于Ziegler流动理论的Kumar-Prasad的Murty-Rao和Babu的不稳定性准则，来开发不稳定图。发现基于Gegel和Alexander-Malas的稳定性标准（或基于Kumar-Prasad，Murty-Rao和Babu的稳定性标准）的不稳定性图基本上相似。然而，两种类型的DMM标准之间的比较表明，不稳定性图彼此完全不同。发现基于齐格勒流动理论的失稳判据在预测流动失稳的发生方面更为可靠，流动失稳表现为非均匀流动和局部变形带。

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  • 来源
    《Materials Science and Engineering》 |2013年第10期|110-122|共13页
  • 作者

    Jingqi Zhang; Hongshuang Di; Kun Mao; Xiaoyu Wang; Zhijie Han; Tianjun Ma;

  • 作者单位

    State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, PR China;

    State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, PR China;

    State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, PR China;

    State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, PR China;

    State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, PR China;

    Baoshan Iron & Steel Co., Ltd., Special Steel Business Unit, Shanghai 200940, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    TWIP steel; Hot deformation; Dynamic materials model; Processing maps; Dynamic recrystallization;

    机译：TWIP钢;热变形;动态材料模型;处理地图;动态重结晶;

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