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首页> 外文期刊>Materials Science and Engineering >Recrystallization of 30Cr2Ni4MoV ultra-super-critical rotor steel during hot deformation. Part I: Dynamic recrystallization
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Recrystallization of 30Cr2Ni4MoV ultra-super-critical rotor steel during hot deformation. Part I: Dynamic recrystallization

机译：30Cr2Ni4MoV超超临界转子钢在热变形过程中的再结晶。第一部分：动态重结晶

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摘要

This paper presents an investigation that characterizes the evolution of the dynamically recrystallized structure of 30Cr2Ni4MoV ultra-super-critical rotor steel during hot deformation, as a starting point for studies of the static recrystallization (SRX) and the metadynamic recrystallization (MDRX) behaviors, by hot compression tests which are performed at the temperatures from 1243 K to 1543 K and strain rates from 0.001 s~(-1) to 0.1 s~(-1) on Gleeble-3500 thermo-mechanical simulator, and the corresponding flow curves are obtained. A third-order polynomial is then fitted to the work hardening region of each curve. The critical stress for initiation of dynamic recrystallization (DRX) can be calculated by setting the second derivative of the third order polynomial. By regression analysis, the activation energy in whole range of deformation temperature is determined to be Q= 368.45 kj/mol. The complete DRX grain size (D_(drx)) of the test steel is a function of Zener-Hollomon parameter (Z) and is independent of the true strain. The relationship of D_(drx) and Z is found to be described in a form of power law function with an exponent of -0.24.
机译：本文提出了一项研究，该研究表征了30Cr2Ni4MoV超超临界转子钢在热变形过程中动态再结晶组织的演变，以此作为研究静态再结晶（SRX）和亚动力学再结晶（MDRX）行为的起点。在Gleeble-3500热力机械模拟器上，在1243 K至1543 K的温度和0.001 s〜（-1）到0.1 s〜（-1）的应变速率下进行热压缩测试，并获得了相应的流量曲线。然后将三阶多项式拟合到每个曲线的加工硬化区域。可以通过设置三阶多项式的二阶导数来计算启动动态重结晶（DRX）的临界应力。通过回归分析，确定变形温度整个范围内的活化能为Q ＝ 368.45kj / mol。测试钢的完整DRX晶粒尺寸（D_（drx））是Zener-Hollomon参数（Z）的函数，并且与真实应变无关。发现D_（drx）和Z的关系以幂律函数的形式描述，指数为-0.24。

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