✍ Scribed by B Strnadel; E Mazancová; K Mazanec
No coin nor oath required. For personal study only.
This contribution presents a model of cleavage crack propagation in spheroid&d steels. Microcrack initiation is considered in precipitated carbide particles when the local stress exceed cleavage strength ur of the carbide given by the Griffith criterion. A major crack is formed by microcrack linking leading to the final fracture instability. Using crack transition probabilities the probability of crack arrest at any given point within the active volume was calculated. The model suggests that the susceptibility of a microstructure to cleavage failure can be assessed by the least value of (x,uS/Ktc) parameter at which the probability of crack arrest P,, is equal to unity.
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The crack propagation velocity in corroGon fatigue (du/dN), were measured on the Ni-Cr-Mo steel quenched and tempered at 473 or 773 K. The steel with high sensitivity to delayed failure reveals the largest (du/dN), under square load and the smaller (da/dN), under positive saw tooth load. The frequen
## AImWet -Based on the fatigue crack propagation (FCP) expression developed by X. Zheng and M. A. Hirt. a new method for the estimation of FCP rate is suggested. It is pointed out that when Ak;,, (the FCP threshold) and the mechanism in the intermediate region of FCP are known, the FCP rates can
Crack nucleation and growth behavior of corrosion fatigue are investigated experimentally and theoretically for 200°C tempered AISI 4340 steel in 35% NaCl solution. The crack nucleation at notch roots is determined by the electrical potential method. The cycle for crack nucleation, N,, increases wit