Nanoscale clusters in secondary hardening ultra-high strength steels with 1 and 3 wt Mo: An atom probe investigation

Veerababu, R and Balamuralikrishnan, R and Karthikeyan, S (2020) Nanoscale clusters in secondary hardening ultra-high strength steels with 1 and 3 wt Mo: An atom probe investigation. In: Journal of Materials Research, 35 (14). pp. 1763-1776.

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Abstract

In the present study, 3D atom probe was used to study the effect of increased Mo (1-3 wt) on clustering in secondary hardening ultra-high strength steels. Clusters have been classified into three categories, namely, Type I, Type II, and Type III with the (Cr + Mo)/C ratio of <1.5, 1.5-3.25, and >3.25, respectively. Cluster evolution suggests that size and volume fraction (Vf) of Type II clusters increase continuously from as-quenched to aged samples, while the number density (Nv) increases in 400 °C aged sample and decreases in 450 and 500 °C samples. On the other hand, Nv and Vf of both Type I and Type III clusters decrease on aging. This work clearly suggests that on aging, Type II clusters, which are close to M2C stoichiometry, become most stable, which may eventually either become M2C precipitates upon prolonged aging or act as potential nuclei for the precipitation of equilibrium M2C precipitates. Copyright © Materials Research Society 2020.

Item Type:	Journal Article
Publication:	Journal of Materials Research
Publisher:	Cambridge University Press
Additional Information:	The copyright for this article belongs to Cambridge University Press.
Keywords:	Advanced high strength Steel; Chromium compounds; Hardening; Probes, 3D atom probes; Atom probe; Nano-scale clusters; Number density; Secondary Hardening; Three categories; Type II, High strength steel
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	03 Feb 2023 04:56
Last Modified:	03 Feb 2023 04:56
URI:	https://eprints.iisc.ac.in/id/eprint/79818

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