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A Study of Crack Initiation in a Low Alloy Steel

30 Pages Posted: 13 May 2021 Publication Status: Under Review

See all articles by Lin Tian

Lin Tian

University of Göttingen - Institut of Materials Physics

Christine Borchers

University of Göttingen - Institut of Materials Physics

Masanobu Kubota

Kyushu University - International Institute for Carbon Neutral Energy Research

Petros Sofronis

Kyushu University - International Institute for Carbon Neutral Energy Research; University of Illinois at Urbana-Champaign - Department of Mechanical Science and Engineering

Reiner Kirchheim

University of Göttingen - aInstitut of Materials Physics; Kyushu University - International Institute for Carbon Neutral Energy Research

Cynthia A. Volkert

University of Göttingen - Institute of Materials Physics

Abstract

Taking advantage of in-situ fracture testing method inside a transmission electron microscope, crack evolution in a low alloy steel under low triaxiality conditions is studied and the interaction between cementite particles and the crack is revealed. It is found that the ferrite matrix is the major void initiation site due to the low stress triaxiality in the TEM sample, which contrasts the behavior under plane strain conditions in bulk specimens, where voids are typically found to initiate by decohesion at the particle/matrix interface. This work reveals that fracture behavior proceeds differently under low triaxiality conditions, such as in thin films, and demonstrates the possibility to avoid interface decohesion and thereby to enhance ductility in steels.

Keywords: fracture, cementite, low alloy steel, void

Suggested Citation

Tian, Lin and Borchers, Christine and Kubota, Masanobu and Sofronis, Petros and Kirchheim, Reiner and Volkert, Cynthia A., A Study of Crack Initiation in a Low Alloy Steel. Available at SSRN: https://ssrn.com/abstract=3845713 or http://dx.doi.org/10.2139/ssrn.3845713

Lin Tian (Contact Author)

University of Göttingen - Institut of Materials Physics ( email )

Göttingen
Germany

Christine Borchers

University of Göttingen - Institut of Materials Physics ( email )

Platz der Gottinger Sieben 3
Gottingen, D-37073
Germany

Masanobu Kubota

Kyushu University - International Institute for Carbon Neutral Energy Research ( email )

6-19-1, Hakozaki, Higashiku
Fukuoka, 812-8581
Japan

Petros Sofronis

Kyushu University - International Institute for Carbon Neutral Energy Research ( email )

6-19-1, Hakozaki, Higashiku
Fukuoka, 812-8581
Japan

University of Illinois at Urbana-Champaign - Department of Mechanical Science and Engineering ( email )

601 E John St
Champaign, IL 61820
United States

Reiner Kirchheim

University of Göttingen - aInstitut of Materials Physics ( email )

Platz der Gottinger Sieben 3
Gottingen, D-37073
Germany

Kyushu University - International Institute for Carbon Neutral Energy Research ( email )

6-19-1, Hakozaki, Higashiku
Fukuoka, 812-8581
Japan

Cynthia A. Volkert

University of Göttingen - Institute of Materials Physics ( email )

Platz der Gottinger Sieben 3
Gottingen, D-37073
Germany

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