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Experimental Determination of Elastic Modulus during Martensitic Transformation of Low Transformation Temperature Steel

机译：低相变温度钢马氏体相变过程中弹性模量的实验确定

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摘要

When steel undergoes a transition from the austenite to the ferrite phase, the molar volume increases with decrease in temperature. The technology that utilizes this character- istic of steel, i.e. increase in molar volume, is suggested in the research field of welding. For instance, low-transforma- tion temperature (LTT) steel is considered to minimize residual stress and deformation after welding. The marten- sitic phase expansion at low-transformation temperature reduces residual stress.'*) The reduction in residual stress subsequently affects the fatigue properties of steel. To verify the effect of martensitic transformation on residual stress, extensive quantitative research has been conducted using the finite element method.” However, because it is diffi- cult to measure elastic parameters during the cooling pro- cess, including the period of martensitic transformation, many studies employ different elastic parameter models in their calculations. Some methods such as ultrasonic> ? and electromagnetic acoustic resonance”) have been used for measuring the elastic parameters of metals and ceramics during the thermal cycle. However, most studies have focused on the elastic behaviour primarily during the heat- ing process,” while few have considered the transforma- tion behaviour during cooling.
机译：当钢经历从奥氏体到铁素体相的转变时，摩尔体积随温度降低而增加。在焊接的研究领域中提出了利用钢的这种特性即增加摩尔体积的技术。例如，低变形温度（LTT）钢被认为可最大程度地减少焊接后的残余应力和变形。低相变温度下的马氏体相膨胀会降低残余应力。'*）残余应力的降低随后会影响钢的疲劳性能。为了验证马氏体相变对残余应力的影响，已使用有限元方法进行了广泛的定量研究。”但是，由于很难在冷却过程中（包括马氏体转变期）测量弹性参数，因此许多研究在计算中采用了不同的弹性参数模型。一些方法，例如超声>？和电磁声共振”）已用于测量热循环过程中金属和陶瓷的弹性参数。但是，大多数研究主要集中在加热过程中的弹性行为，”而很少考虑冷却过程中的转变行为。

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