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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of temperature on flow and work hardening behavior of high bainite dual phase (HBDP) steels
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Effect of temperature on flow and work hardening behavior of high bainite dual phase (HBDP) steels

机译：温度对高贝氏体双相（HBDP）钢流动和加工硬化行为的影响

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摘要

High bainite dual phase steel has been subjected to tension test at different temperatures from 25 to 500 ℃ with strain rate of 4.6 × 10~(-4) s~(-1) to investigate the effect of temperature on its mechanical properties. Stress-strain curves of steels showed serration flow at temperature range of 200-350 ℃ and smooth flow at the other temperatures. In agreement with previous studies on some steels, peaks in the variations of yield strength (YS) and ultimate tensile strength (UTS) and minima in ductility were observed at temperature range of 200-350 ℃ which are various manifestations of dynamic strain aging (DS A). It has been also found that ferrite volume fraction has no effect on the temperature range of serrated flow but work hardening decreased slightly with increasing ferrite volume fraction. The tensile test data were also analyzed in term of Hollomon equation and it was found that this steel has two work hardening stages. In this study the effects of temperature on Hollomon equation parameters and onset strain of stage II hardening were investigated. The observed peaks/plateaus in the variation of Hollomon equation parameters with temperature at the intermediate temperature range have been identified as the other manifestation of dynamic strain aging. The work hardening analysis of flow stress data revealed that, in the DSA region, the onset strain of stage II work hardening is athermal.
机译：对高贝氏体双相钢在25〜500℃的不同温度下进行了拉伸试验，应变率为4.6×10〜（-4）s〜（-1），以研究温度对其力学性能的影响。钢的应力-应变曲线显示，在200-350℃的温度范围内锯齿状流动，而在其他温度下则呈现平滑状。与先前对某些钢的研究一致，在200-350℃的温度范围内观察到屈服强度（YS）和极限抗拉强度（UTS）变化的峰值以及延展性的最小值，这是动态应变时效（DS）的多种表现形式一个）。还已经发现，铁素体体积分数对锯齿状流动的温度范围没有影响，但是加工硬化随铁素体体积分数的增加而略微降低。还根据Hollomon方程对拉伸试验数据进行了分析，发现该钢具有两个加工硬化阶段。在这项研究中，研究了温度对Hollomon方程参数和第二阶段硬化开始应变的影响。 Hollomon方程参数随温度在中间温度范围内变化而观察到的峰值/平台已确定为动态应变老化的另一种表现。流动应力数据的加工硬化分析表明，在DSA区域，II期加工硬化的起始应变是无热的。

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