The Relationships between the Transformation Characteristics and the Fracture and Fatigue Properties of TRIP Steels.
SYRACUSE UNIV N Y DEPT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCE
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EMechanics, Crack propagation, Austenite, Martensite, High strength alloys, Temperature, Plasticity, Tensile properties, StrainMechanics, Stress strain relationsTRIP steelsThe deformation - transformation characteristics and their relationships to static and fatigue properties were studied for a number of 9 Ni, 9 Cr, 4 Mo, 1 Mn and 13 Co, 2 Ni, 15 Cr, 5 Mo, 0.5 Mn, all 0.2 - 0.3 C type TRIP steels. Under room temperature monotonic tensile loading the TRIP steels tested deform linearly to a stress maximum which is followed by a sharp yield drop. No appreciable amount of martensite formation was detected during the linear portion, while rapid martensite formation occurs during Luders band formation and spreading, thus supporting the suggestion that martensite transformation is strain nucleated. The notch tensile strength or toughness was found to be strongly temperature dependent. Fatigue crack growth rates were also found to be quite sensitive to austenite metastability. Modified author abstract
- Properties of Metals and Alloys