Effect of Tempering on the Bainitic Microstructure Evolution Correlated with the Hardness in a Low-Alloy Medium-Carbon Steel
Artikel i vetenskaplig tidskrift, 2020

A low-alloy medium-carbon bainitic steel was isothermally tempered at 300 degrees C for up to 24 hours which led to a significant hardness decrease. In order to explain the decreasing hardness, extensive microstructural characterization using scanning and transmission electron microscopy, X-ray diffraction, and atom probe tomography was conducted. The experimental work was further supplemented by thermodynamic and kinetic simulations. It is found that the main underlying reason for the hardness reduction during tempering is related to dislocation annihilation, possibly also with corresponding changes in Cottrell atmospheres. On the other hand, cementite precipitate size, effective grain size of the bainite, and retained austenite fraction appear unchanged over the whole tempering cycle.

Författare

Adam Stahlkrantz

Husqvarna

Kungliga Tekniska Högskolan (KTH)

Peter Hedstrom

Kungliga Tekniska Högskolan (KTH)

Niklas Sarius

Husqvarna

Hans-Ake Sundberg

Husqvarna

Soren Kahl

Husqvarna

Mattias Thuvander

Chalmers, Fysik, Mikrostrukturfysik

Annika Borgenstam

Kungliga Tekniska Högskolan (KTH)

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

1073-5623 (ISSN)

Vol. In Press

Ämneskategorier

Oorganisk kemi

Materialkemi

Metallurgi och metalliska material

Infrastruktur

Chalmers materialanalyslaboratorium

Styrkeområden

Materialvetenskap

DOI

10.1007/s11661-020-06030-6

Mer information

Senast uppdaterat

2020-11-27