Tempering and Austempering of Double Soaked Medium Manganese Steels

Glover, Alexandra Gannon; Speer, John G.; De Moor, Emmanuel

doi:10.3389/fmats.2020.622131

Tempering and Austempering of Double Soaked Medium Manganese Steels

Journal Article · Wed Mar 24 00:00:00 EDT 2021 · Frontiers in Materials

DOI:https://doi.org/10.3389/fmats.2020.622131· OSTI ID:1807871

Glover, Alexandra Gannon ^[1]; Speer, John G. ^[2]; De Moor, Emmanuel ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Colorado School of Mines, Golden, CO (United States)
Colorado School of Mines, Golden, CO (United States)

The addition of a tempering or austempering step to the double soaking of a 0.14C–7.17Mn (wt pct) steel was investigated in the present contribution. The double soaking heat treatment is a two-step intercritical annealing heat treatment, which generates microstructures of athermal martensite, retained austenite and ferrite when applied to medium manganese steels. Microstructures following double soaking and (aus)tempering contained a combination of retained austenite, athermal or tempered martensite, and blocky or bainitic ferrite. X-ray diffraction, dilatometry and transmission Kikuchi diffraction were utilized to investigate microstructural changes which occurred during tempering or austempering. The resulting mechanical properties were measured using uniaxial tensile testing. The double soaking plus tempering heat treatment was shown to generate an ultimate tensile strength of 1,340 MPa in combination with 28 pct total elongation while the double soaking plus austempering heat treatment resulted in an ultimate tensile strength of 1,675 MPa and total elongation of 22 pct. Overall, both novel heat treatments produced a combination of strength and ductility desired for the third generation of advanced high strength steels.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: Advanced Steel Processing and Products Research Center (ASPPRC)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1807871

Report Number(s):: LA-UR--20-28654

Journal Information:: Frontiers in Materials, Journal Name: Frontiers in Materials Vol. 7; ISSN 2296-8016

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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