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首页> 外文期刊>ISIJ international >Strain-induced Transformation Behaviour of Retained Austenite and Tensile Properties of TRIP-aided Steels with Different Matrix Microstructure
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Strain-induced Transformation Behaviour of Retained Austenite and Tensile Properties of TRIP-aided Steels with Different Matrix Microstructure

机译：不同基体组织的TRIP辅助钢的残余奥氏体应变诱导相变行为和拉伸性能

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摘要

The effects of strain rate and temperature on the strain induced transformation behaviour of retained austenite and hence mechanical properties of TRIP-aided steels with annealed martensite (AM), bainitic fer-rite (BF) and polygonal ferrite (PF) matrix microstructures were examined. For this, tensile tests were carried out at four different strain rates varying from 3.33 x 10~(-5)s~(-1) to 3.33 x 10~(-2)s~(-1) at room temperature and at 150℃. Additional intermittent tests were carried out at intermediate strain rates to estimate the extent of strain induced transformation of austenite to martensite using X-ray diffraction analysis. Tensile strength (TS) decreased with strain rate at both temperatures, though the TS at 150℃ was lower for all steels except for BF steel tested at 3.33 x 10~(-5)s~(-1). The total elongation (TEL) for PF steel significantly improved at 150℃ at all strain rates, with a maximum of 78% obtained at 3.33x10~(-3)s~(-1), the corresponding TS being 930 MPa. A similar effect was seen in AM steels tested at 3.33 x 10(-3)s~(-1) and 3.33 x 10~(-4)s~(-1) However, in BF steel, higher temperature had a detrimental effect on TEL, especially at strain rates of 3.33x10~(-2)s~(-1) and 3.33x10~(-3)s~(-1).
机译：研究了应变速率和温度对残余奥氏体的应变诱导相变行为的影响，并研究了带有退火马氏体（AM），贝氏体铁素体（BF）和多边形铁素体（PF）的TRIP辅助钢的力学性能。为此，在室温和150°C的四个不同应变率下进行拉伸测试，应变率从3.33 x 10〜（-5）s〜（-1）到3.33 x 10〜（-2）s〜（-1）。 ℃。在中应变速率下进行了其他间歇测试，以估计使用X射线衍射分析得出的应变诱发的奥氏体向马氏体转变的程度。尽管在3.33 x 10〜（-5）s〜（-1）下测试的高炉钢，所有钢在150℃下的拉伸强度均较低，但在两种温度下拉伸强度（TS）均随应变率而降低。在所有应变速率下，PF钢的总伸长率（TEL）在150℃时都有显着提高，在3.33x10〜（-3）s〜（-1）时，最大伸长率达到78％，相应的TS为930 MPa。在以3.33 x 10（-3）s〜（-1）和3.33 x 10〜（-4）s〜（-1）测试的AM钢中也观察到了类似的效果。但是，在高炉钢中，较高的温度会有不利的影响在TEL上，尤其是在3.33x10〜（-2）s〜（-1）和3.33x10〜（-3）s〜（-1）的应变速率下。

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