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Dynamic Recrystallization Behavior of AISI 420 Stainless Steel under Hot Compression

机译:热压下AISI 420不锈钢的动态再结晶行为

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Hot deformation behavior of AISI 420 stainless steel was studied under hot compression tests in the temperature range of 950 to 1150 °C and strain rates of 0.01 s~(?1)and 0.1 s~(?1). The study indicates that higher deformation temperature makes the peak stress pronounced and the occurrence of DRX is detected by inflection point in the work hardening rate vs. flow stress ( θ - σ ) plot, irrespective of the shape of flow stress curve. Local misorientation ( M _(L)) was calculated to reveal the local change in the crystal orientation. The distribution of M _(L)suggested that the process of DRX reduces the local misorientation during hot deformation. The critical stress for initiation of DRX under different deformation conditions was determined by setting the derivative of the third order polynomial to θ - σ plot. A good linear relationship between critical stress ( σ _(c)) & critical strain ( ε _(c)) and Zener-Hollomon parameter was established.
机译:在950至1150°C的温度范围内,应变率为0.01 s〜(?1)和0.1 s〜(?1)的条件下,通过热压缩试验研究了AISI 420不锈钢的热变形行为。研究表明,较高的变形温度使峰值应力明显,并且在工作硬化率与流动应力(θ-σ)曲线中的拐点处可以检测到DRX的发生,而与流动应力曲线的形状无关。计算出局部取向差(M_(L))以揭示晶体取向的局部变化。 M_(L)的分布表明DRX的过程减少了热变形过程中的局部取向错误。通过将三阶多项式的导数设置为θ-σ图,可以确定在不同变形条件下DRX引发的临界应力。建立了临界应力(σ_(c))和临界应变(ε_(c))与Zener-Hollomon参数之间的良好线性关系。

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