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本文借助于声发射试验的相对能量分析,对二种工业用钢在连续冷却条件下的马氏体相变过程进行了初步探讨,结果表明:声发射试验可以提供马氏体相变全过程的某些信息,例如18Cr2Ni4WA钢的低碳板条马氏体相变过程的释放能量的振幅A与温度T的曲线呈连续型,而象Gcr15钢的高碳片状马氏体相变过程的A～T曲线则呈非连续型。如果假定在给定奥氏体化温度T_A下在转变温度范围内形成单位体积马氏体所释放的能量相等,则可在前者的转变过程中得到类似C.L.Magee推导[10]的线性动力学方程,当令转变分数,分别为1%和99%代入方程所计算的M_s和M_f点与金相分析结果相当吻合;但在后者的转变过程中上述动力学方程的线性度显著下降。
In this paper, with the aid of the relative energy analysis of acoustic emission test, the martensitic transformation process of two kinds of industrial steels under continuous cooling conditions is discussed. The results show that the acoustic emission test can provide the whole process of martensitic transformation Some information, such as 18Cr2Ni4WA steel low-carbon martensitic lath martensitic transformation process of the amplitude of the amplitude A and the curve of the temperature T continuous type, and as Gcr15 steel carbon sheet martensite transformation process of A ~ T curve was non-continuous type. If we assume that the energy released by the formation of unit volumetric martensite at a given temperature range for a given austenitizing temperature T_A is equal, a linear kinetic equation similar to CLMagee derivation [10] can be obtained during the former transition , And the M_s and M_f points calculated by substituting 1% and 99% of the change fraction into the equation are in good agreement with the results of the metallographic analysis. However, the linearity of the above kinetic equation is significantly decreased in the latter transition.