Lath formation mechanisms and twinning as lath martensite substructures in an ultra low-carbon iron alloy.

Abstract:

:Lath martensite is the dominant microstructural feature in quenched low-carbon Fe-C alloys. Its formation mechanism is not clear, despite extensive research. The microstructure of an Fe-0.05 C (wt.%) alloy water-quenched at various austenitizing temperatures has been investigated using transmission electron microscopy and a novel lath formation mechanism has been proposed. Body-centered cubic {112}〈111〉-type twin can be retained inside laths in the samples quenched at temperatures from 1050 °C to 1200 °C. The formation mechanism of laths with a twin substructure has been explained based on the twin structure as an initial product of martensitic transformation. A detailed detwinning mechanism in the auto-tempering process has also been discussed, because auto-tempering is inevitable during the quenching of low-carbon Fe-C alloys. The driving force for the detwinning is the instability of ω-Fe(C) particles, which are located only at the twinning boundary region. The twin boundary can move through the ω ↔ bcc transition in which the ω phase region represents the twin boundary.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Ping DH,Guo SQ,Imura M,Liu X,Ohmura T,Ohnuma M,Lu X,Abe T,Onodera H

doi

10.1038/s41598-018-32679-6

subject

Has Abstract

pub_date

2018-09-24 00:00:00

pages

14264

issue

1

issn

2045-2322

pii

10.1038/s41598-018-32679-6

journal_volume

8

pub_type

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