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首页> 外文期刊>Journal of Materials Engineering and Performance >An Investigation on Constitutive Relation and Dynamic Recrystallization of Hastelloy C-276 Alloy During Hot Deformation
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An Investigation on Constitutive Relation and Dynamic Recrystallization of Hastelloy C-276 Alloy During Hot Deformation

机译：热变形过程中Hastelloy C-276合金本构关系及动态再结晶的研究

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Hot compression tests of Hastelloy C-276 alloy were conducted at the temperature ranging from 1000 to 1250 degrees C and strain rate ranging from 0.01 to 10 s(-1). The constitutive relation and critical points of dynamic recrystallization (DRX) of the Hastelloy C-276 alloy were analyzed. The flow stress curves were corrected to tackle the problems of the influence of the adiabatic heating and friction. It was revealed that a five-order polynomial was suitable to solve the problem of the influence of strain. The critical strains of DRX could be expressed by the calculation from strain hardening rate as epsilon(c) = 7.67 x 10(-4)Z(0.144) and epsilon(c) approximate to 0.78 epsilon(p). Microstructural evolution revealed that the development of DRX of the alloy was complete at high temperature and low strain rate and the DRX grain size increased with the increase in temperature. The volume fraction of DRX was increased, and the grain size of DRX was also slightly increased with the increase in strain. The main nucleation mechanism of DRX was discontinuous dynamic recrystallization (DDRX), which was characterized by the grain boundary bowing nucleation mechanism coupled with the twinning-induced nucleation mechanism. Sigma 3 twins also contribute to the grain refinement and homogenization during hot deformation. The grains of C-276 alloy were refined significantly, and the microstructural homogeneity was improved effectively during hot deformation at high temperature and low strain rate. By choosing the suitable hot working processing parameters, the refinement and uniform distribution of grains of Hastelloy C-276 alloy could be obtained.
机译：Hastelloy C-276合金的热压缩试验在1000至1250℃的温度下进行，应变速率范围为0.01至10 s（-1）。分析了哈斯泰洛约C-276合金的动态再结晶（DRX）的本构关系和关键点。校正流量应力曲线以解决绝热加热和摩擦的影响问题。据透露，五阶多项式适合解决应变的影响问题。 DRX的临界菌株可以通过作为ε（c）= 7.67×10（-4）z（0.144）和ε（c）近似为0.78ε（p）的慢性硬化率计算。微观结构的进化表明，合金Drx的发展在高温下完成，低应变率下降，DRX晶粒尺寸随温度的增加而增加。 DRX的体积分数增加，随着菌株的增加，DRX的晶粒尺寸也略有增加。 DRX的主要成核机理是不连续的动态重结晶（DDRX），其特征在于晶界弯曲成核机理与孪生诱导的核切割机制相结合。 Sigma 3双胞胎也有助于在热变形过程中晶粒细化和均质化。 C-276合金的晶粒显着精制，并且在高温下热变形期间有效地改善了微观结构均匀性。通过选择合适的热工作处理参数，可以获得哈斯泰洛约C-276合金晶粒的细化和均匀分布。

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