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Determination of the critical conditions for the initiation of dynamic recrystallization in boron microalloyed steels

机译：确定硼微合金钢中动态再结晶引发的临界条件

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摘要

From the present research, the critical conditions associated with the onset of dynamic recrystallization (DRX) of hot deformed boron microalloyed steels were precisely determined based on changes in the strain hardening rate (θ) as a function of the flow stress. For this purpose, a low carbon steel microalloyed with four different amounts of boron (29,49,62 and 105 ppm) was deformed by uniaxial hot-compression tests at high temperature (950,1000,1050 and 1100℃) and constant true strain rate (10~(-3),10~(-2) and 10~(-1) s~(-1)). Results indicate that the critical conditions for the initiation of dynamic recrystallization depend on the temperature and strain rate. In addition, both critical stress σ_c, and critical strain ε_c, were noticed to decrease as boron content increased. Such a behavior is attributed to a solute drag effect by boron atoms on the austenitic grain boundaries and also to a solid solution softening effect. The critical ratios σ_c/σ_p and ε_c/ε-p for all boron microalloyed steels remain fairly constant (≈0.82 and ≈0.53, respectively), such values are in agreement with those commonly reported for Al-killed, C-Mn, Nb, Nb-Ti, high carbon and stainless steels.
机译：根据目前的研究，基于应变硬化率（θ）与流应力的函数关系，可以精确地确定与热变形硼微合金钢的动态再结晶（DRX）发生有关的临界条件。为此，在高温（950、1000、1050和1100℃）下通过单轴热压试验使含有四种不同量的硼（29、49、62和105 ppm）的低碳钢微变形。速率（10〜（-3），10〜（-2）和10〜（-1）s〜（-1））。结果表明，引发动态重结晶的关键条件取决于温度和应变速率。另外，随着硼含量的增加，临界应力σ_c和临界应变ε_c均减小。这种行为归因于硼原子对奥氏体晶界的溶质拖曳作用，也归因于固溶体软化作用。所有硼微合金钢的临界比σ_c/σ_p和ε_c/ε-p保持相当恒定（分别为≈0.82和≈0.53），这些值与通常报道的铝镇静，C-Mn，Nb，铌钛，高碳和不锈钢。

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