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用倒扭摆法测试了18 Ni马氏体时效钢的低频内耗.发现在降温中于165℃附近出现正马氏体相变内耗峯.在升温中于700℃附近出现反马氏体相变内耗峯.内耗峯的高度与T/f(T—温度变化速率,f—振动频率)成线性关系,恒温测量时,相变内耗降为背景值.还观察到相变过程中,切变模量发生软化.我们认为这个内耗是由外加切应力促进或加速接近临界的马氏体胚芽的界面位错滑移所引起.
The low frequency internal friction of 18 Ni martensitic steel was tested by inverted pendulum method, and the internal friction peak of positive martensitic transformation appeared near 165 ℃ during cooling, and the internal friction of anti-martensitic transformation appeared near 700 ℃ Peak. The height of the internal friction peak is linear with the T / f (T-temperature rate, f-vibration frequency), and the internal dissipation is assumed to be the background value at the constant temperature measurement. It is also observed that during the phase transition, the shear modulus Softening occurs.We think that this internal friction is caused by the interfacial dislocation slip of martensite germ that is accelerated or accelerated by the applied shear stress.