Abstract
This chapter analyzes the influence of liquid metal on the mechanical behavior of Fe9Crl Mo martensitic steel. The recommended heat treatment for the T91 steel consists of an austenization at 1050°C followed by air quenching and then tempering at 750°C for 1 h. The fatigue tests are conducted in a fully push-pull mode at imposed total strain variations ranging from 0.4 to 2.4%. Tempering at 500°C increases the yield stress up to 900 MPa, but the plasticity domain remain large up to 15% at fracture after a test at 350°C in air and liquid Pb. A strong reduction in the fracture elongation for the test in liquid lead compared to that in air suggests a possible embrittlement of the steel by the liquid metal. The fractographic analysis reveals ductile fracture with characteristic dimples for specimens tested in air, and cleavage-like transgranular brittle fracture for specimens tested in the liquid metals. Close inspection of a specimen's surface reveals that the machining of the notch causes the formation of a hard cold-worked coat 10 μm thick that breaks during tensile tests. In a liquid metal environment the microcracks generated in this manner have a brittle propagation, while this does not appear to be the case in air.
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