A new XRD method to quantify plate and lath martensites of hardened medium-carbon steel

LUO, Quanshun (2016). A new XRD method to quantify plate and lath martensites of hardened medium-carbon steel. Journal of Materials Engineering and Performance, 25 (6), 2170-2179.

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Official URL: http://link.springer.com/article/10.1007/s11665-01...
Link to published version:: 10.1007/s11665-016-2053-0

Abstract

This paper introduces a new technique to separately measure the volume fraction and tetragonal ratio of co-existing lath and plate martensites in ultrahigh strength steel, and to calculate their different carbon contents. First of all, the two martensites are assumed to have body centre tetragonal lattice structures of different tetragonal ratios. X-ray diffraction is then applied to obtain the overlapping (200) diffraction peak, which is subsequently separated as four sub-peaks using a self-made multiple Gaussian peak-fitting method to allow the measurement of the individual lattice parameters c and a. Finally a modified equation is applied to calculate the carbon contents from the obtained tetragonal ratios. The new technique is then applied to investigate the effect of subsequent tempering on the decarbonisation of the as-quenched martensites. Keywords: Gaussian peak-fitting, martensite carbon content, martensite tetragonal ratio, medium-carbon steels, Xray diffraction

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Materials Analysis and Research Services
Identification Number: 10.1007/s11665-016-2053-0
Depositing User: Quanshun Luo
Date Deposited: 08 Jun 2016 10:39
Last Modified: 06 Dec 2016 03:54
URI: http://shura.shu.ac.uk/id/eprint/12383

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