Microstructure Evolution and Kinetics of Static Recrystallization of Medium Mn Steel in the Two‐Hit Isothermal Compression,Steel Research International

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Microstructure Evolution and Kinetics of Static Recrystallization of Medium Mn Steel in the Two‐Hit Isothermal Compression
Steel Research International ( IF 1.9 ) Pub Date : 2020-10-13 , DOI: 10.1002/srin.202000443
Xiaoyun Sun _{1,

2} , Mei Zhang _{1,

3} , Yang Wang ₁ , Jin Liu ₁

Affiliation

The thermal deformation behavior and microstructure evolution of medium Mn steel (0.15C–7Mn) are investigated by the two‐hit compression tests. The results reveal that different static softening dynamics are the functions of deformation temperature, interval time, and strain rate. The short static softening plateaus are exhibited in the static softening curves during post‐deformation holding at 950 °C and 0.1, 1 s⁻¹. Based on the electron backscatter diffraction (EBSD) analysis, the progresses of static recovery (SRV) and static recrystallization (SRX) are enhanced by the increment of deformation temperature. The frequencies of medium angle boundaries (MAGBs) and high angle boundaries (HAGBs) increase gradually with an increased interval time at 1000 °C and 0.1 s⁻¹, which suggests that both SRV and SRX contribute to static softening, but the predominant softening mechanism is SRV. In addition, the influence of temperature, interval time, and strain rate on the distribution and average magnitude of grain size is investigated. The deformation temperature and strain rate have a significant influence not only on average grain dimension, but also on the distribution of grain size. Interval time has great influence on average grain size, but has slight effect on distribution of grain size.

中文翻译：

等温二次热压缩中锰钢的组织演变和静态再结晶动力学

通过两次压缩试验研究了中锰钢（0.15C–7Mn）的热变形行为和组织演变。结果表明，不同的静态软化动力学是变形温度，间隔时间和应变率的函数。在变形后保持在950°C和0.1，1 s ^-1时的静态软化曲线中表现出较短的静态软化平稳期。基于电子背散射衍射（EBSD）分析，随着变形温度的升高，静态回复（SRV）和静态再结晶（SRX）的进展得以增强。在1000°C和0.1 s ^-1时，中角边界（MAGB）和高角边界（HAGB）的频率随着间隔时间的增加而逐渐增加，这表明SRV和SRX都有助于静态软化，但主要的软化机制是SRV。另外，研究了温度，间隔时间和应变速率对晶粒尺寸分布和平均大小的影响。变形温度和应变速率不仅对平均晶粒尺寸有重要影响，而且对晶粒尺寸的分布也有显着影响。间隔时间对平均晶粒尺寸有很大的影响，但对晶粒尺寸的分布影响很小。

更新日期：2020-10-13

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