Strain-induced transformation behaviour of retained austenite and tensile properties of TRIP-aided steels with different matrix microstructure
Strain-induced transformation behaviour of retained austenite and tensile properties of TRIP-aided steels with different matrix microstructure
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DOI：
10.2355/isijinternational.46.316
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发表时间：
2006-01-01
影响因子：
1.8
通讯作者：
Sugimoto, Koh-ichi
中科院分区：
文献类型：
--
作者：
Mukherjee, Monideepa;Mohanty, Omkar Nath;Sugimoto, Koh-ichi
研究了应变速率和温度对残余奥氏体应变诱导转变行为以及退火马氏体（AM）、贝氏体铁素体（BF）和多边形铁素体（PF）基体组织的trip辅助钢力学性能的影响。为此，在室温和150℃下，以四种不同的应变速率(从3.33X10(-5)s（-1）到3.33X10（-2)s(-1)）进行拉伸试验。另外，在中等应变速率下进行间歇试验，利用x射线衍射分析来估计应变诱导奥氏体向马氏体转变的程度。在这两种温度下，抗拉强度（TS）随应变率而下降，尽管除了在3.33X10(-5)s（-1）下测试的BF钢外，所有钢在150℃时的TS都较低。在150℃下，所有应变速率下，PF钢的总伸长率（TEL）均有显著提高，在3.33X10(-3)s（-1）条件下，最高伸长率达到78%，对应的TS为930 MPa。在3.33X10(-3)s（-1）和3.33X10(-4)s（-1）下测试的AM钢中也看到了类似的效果。然而，在BF钢中，较高的温度对TEL有不利影响，特别是在应变速率为3.33X10(-2)s（-1）和3.33X10(-3)s（-1）时。
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 ferrite (BF) and polygonal ferrite (PF) matrix microstructures were examined. For this, tensile tests were carried out at four different strain rates varying from 3.33X10(-5)s(-1) to 3.33X10(-2)s(-1) at room temperature and at 150 degrees C. 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 degrees C was lower for all steels except for BF steel tested at 3.33X10(-5)s(-1). The total elongation (TEL) for PF steel significantly improved at 150 degrees C 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 3.33X10(-3)s(-1) and 3.33X10(-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).