Fracture of martensitic AISI 52100 steel with 12% retained austenite was experimentally studied at temperatures below the tempering temperature by K_Ic tests and at extremely low loading rates. Depending on temperature, K_Ic and J_C decreased with 6% to 23% for slow rates. It increased with temperature at standard rate but not for slow loading. FE-simulations with elasto-plasticity, phase transformation and low-temperature creep predicted increased crack tip zone with inelastic strains for slow compared to standard rates. The changes in K_Ic due to temperature and loading rate was explained in terms of creep and strain-induced transformation at the crack tip.

在低于回火温度的温度下，通过K _Ic试验和极低的加载速率，通过实验研究了残余奥氏体含量为12％的马氏体AISI 52100钢的断裂。根据温度的不同，K _Ic和J _C的降低速率会降低6％至23％。它以标准速率随温度增加，但不适用于缓慢加载。与标准速率相比，具有弹塑性，相变和低温蠕变的有限元模拟预测，由于非弹性应变，裂纹尖端区域增加。由温度和载荷率引起的K _Ic的变化用裂纹尖端处的蠕变和应变诱导的相变来解释。