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- W2606860135 abstract "Relations between low-temperature aging and serrated flow for Ni-maraging steels and 13Cr-maraging stainless steels have been investigated by specific heat and electric resistance measurements, and also by the tensile test in the temperature range from room temperature to 500°C. The results obtained are sununarized as follows:(1) The observed serrated flows are correlated with the low-temperature aging due to the clustering or the rich-zone formation of substitutional solutes. However, the value of activation volume for the initial flow is unaffected by the aging reaction.(2) Serrations are classified into two types. Type A or a very small and irregular serration occurs immediately after yielding, and type B or a distinct and regular serration occurs after a few percents of plastic deformation. (3) For the mechanism of the A-type serration, a dynamic strain aging process proceeds in which moving dislocations are alternately pinned and released by solute. Then, dislocations become more tightly pinned as deformation proceeds. In the B-type serration, on the other hand, Lüders bands are generated and localized deformation occurs, when, at the critical stress, a group of dislocations is suddenly multiplied.(4) The mean amplitude of the B-type serration increases with increasing test temperature or decreasing strain rate. The apparent activation energy of 40 kcal/mol for the occurrence of the B-type serration is in good agreement with that for the low-temperature aging. Thus, it is suggested that the strain aging is due to a redistribution or reorientation of substitutional solute atoms in the stress field of dislocations,by mechanisms involving the stress-induced diffusion." @default.
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- W2606860135 date "1973-01-01" @default.
- W2606860135 modified "2023-10-14" @default.
- W2606860135 title "Low-Temperature Aging and Serrated Flow in Substitutional Martensitic Iron-Base Alloys" @default.
- W2606860135 doi "https://doi.org/10.2320/jinstmet1952.37.12_1330" @default.
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