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Modelling the Strengthening and Softening Mechanisms in Maraging Steel 250
Journal
Lecture Notes in Mechanical Engineering
ISSN
21954356
Date Issued
2022-01-01
Author(s)
Jacob, Kevin
Dixit, Saurabh
Nagamani Jaya, B.
Abstract
Plastic flow of materials is dependent on the ability of dislocations to move along specific crystallographic planes under the application of an external stress. Hindrances encountered to this flow will result in a higher stress required to facilitate this movement, leading to the overall hardening of the material. In certain situations, however dislocations prefer to move along a single plane in a condition called as planar slip, the occurrence of which leads to an overall softening of the material. Maraging steels are one such class of materials that exhibit primarily planar slip on solutionising. Upon ageing, they acquire a diverse microstructure with the presence of lath boundaries, precipitates and reverted austenite each of which have a different effect on the overall hardening behaviour of the material. In the current study, the extent of different strengthening or softening mechanisms was quantified as a function of ageing parameters in maraging steel 250. The effect of precipitation in changing the mechanism from softening to hardening is studied through finite element modelling to understand the distribution of stresses, strain partitioning and eventually on the composite stress–strain behaviour. This will help explain the differences in structural integrity of these steels under different ageing conditions.
Subjects