On the observation of a partial shape memory effect in a Cr---Mn---N austenitic stainless steel

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On the determination of the distribution of creep cavities

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Influence of microstructure on void nucleation and growth in a near-α titanium alloy IMI 685

Fracture at room temperature by void nucleation and growth has been investigated in IMI 685, a near-α aircraft titanium alloy containing nominally (by wt.%) 6Al, 5Zr, 0.5Mo and 0.25Si. Three different microstructures, namely coarse-aligned α(Aα), basket-weave α(Bα) and martensitic α(Mα), were obtained after solution treatment in the β range followed by cooling at different rates. Progress of fracture as a function of strain was investigated through measurements of the volume fraction, number density and size distribution of the voids as well as the length of the longest void. Void nucleation occurred at α-β interfaces in Aα and along the α platelets and/or martensitic laths as also α-α intersections in Bα and Mα. Void growth was along the α-α or α-β interfaces. Fracture strain was inversely proportional to the longest void growth rate. A linear relationship was observed between the fracture stress and the length of the longest void at fracture

Monotonic and low cycle fatigue behavior of an O+B2 alloy at high temperatures

Low cycle fatigue behavior of an O+B2 alloy was evaluated at 650 degrees C in ambient atmosphere under fully reversed total axial strain controlled mode. Three different microstructures, namely equiaxed O plus aged B2 (fine O plates in B2 matrix), lenticular O laths plus aged B2 and a pancake composite microstructure comprising equiaxed alpha 2, lenticular O and aged B2, were selected to study the effect of microstructure on low cycle fatigue behavior in this class of alloys. Distinct well-defined trends were observed in the cyclic stress-strain response curves depending on the microstructure. The cyclic stress response was examined in terms of softening or hardening and correlated with microstructural features and dislocation behavior. Fatigue life was analyzed in terms of standard Coffin-Manson and Basquin plots and for all microstructures a prevailing elastic strain regime was identified, with a single slope for microstructures equiaxed and composite and a double slope for lenticular O laths