Alloy Partitioning Effect on Strength and Toughness of κ-Carbide Strengthened Steels

Field, Daniel M.; Limmer, Krista R.; Hornbuckle, Billy C.; Pierce, Dean T.; Moore, Ken E.; Sebeck, Katherine M.

doi:10.3390/ma15051670

Title: Alloy Partitioning Effect on Strength and Toughness of κ-Carbide Strengthened Steels

Journal Article · 23 February 2022 · Materials

DOI: https://doi.org/10.3390/ma15051670 · OSTI ID:1866665

^[1];

^[1]; Hornbuckle, Billy C. ^[1];

^[2]; Moore, Ken E. ^[2]; Sebeck, Katherine M. ^[3]

Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
US Army Combat Capabilities Development Command, Warren, MI (United States)

Alloy partitioning during heat treatment in a lightweight precipitation hardened steel was investigated using transmission electron microscopy and atom probe tomography. The mechanical properties are discussed as a function of the effect of solution treatment temperature and aging time, giving rise to variations in chemical modulation. A wrought lightweight steel alloy with a nominal composition of Fe-30Mn-9Al-1Si-1C-0.5Mo (wt. %) was solution-treated between 1173–1273 K and aged at 773 K. Lower solution treatment temperatures retained a finer grain size and accelerated age hardening response that also produced an improved work hardening behavior with a tensile strength of -1460 MPa at 0.4 true strain. Atom probe tomography indicated these conditions also had reduced modulation in the Si and Al content due to the reduced aging time preventing silicon from diffusing out of the κ-carbide into the austenite. This work provides the framework for heat-treating lightweight, age hardenable steels with high strength and improved energy absorption.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1866665

Journal Information:: Materials, Journal Name: Materials Journal Issue: 5 Vol. 15; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
age-hardening steel
alloy partitioning
low density steel
κ-carbide

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