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采用声发射法在连续冷却条件下对GCr15钢马氏体相变过程进行研究,得到了不同形态马氏体声发射信号的时频特性,并引入声发射温度外参数,测得GCr15马氏体相变开始温度Ms点。结果表明:有效值电压(RMS)能实现马氏体体积分数的准确表征。
Acoustic emission method was used to study the martensitic transformation of GCr15 steel under the condition of continuous cooling. The time-frequency characteristics of the acoustic emission signals of different forms of martensite were obtained. The external parameters of acoustic emission temperature were introduced to measure the martensitic transformation of GCr15 martensite Phase change start temperature Ms point. The results show that the effective voltage (RMS) can accurately represent the volume fraction of martensite.