Effect of maximum test temperature on crack propagation behavior of an Austenitic cast steel during Themlo − Mechanical Fatigue ( TMF ) tests was explored under the In − Phase ( IP ) and Out − of − Phase ( OP ) conditions . The behavior was comprared with that of isothermal low cycle fatigue . The experimental results clearly showed that additional mechanism ( s ) mecha lism to pure fatigue begun to work , when the maxim temperature get higher enough . It was also shown that not only the

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... cal factors but the microstumctural features ; e. g . , microsegragation around dendritic boundaries , played an important role in the crack progation process .