Version 1
: Received: 4 July 2019 / Approved: 8 July 2019 / Online: 8 July 2019 (12:16:12 CEST)
How to cite:
Sun, M.; Wang, X.; Misra, R. On the Determining Role of Texture in Causing Delamination During Impact Fracture of Ti and Nb-Ti Microalloyed Steel. Preprints2019, 2019070113. https://doi.org/10.20944/preprints201907.0113.v1.
Sun, M.; Wang, X.; Misra, R. On the Determining Role of Texture in Causing Delamination During Impact Fracture of Ti and Nb-Ti Microalloyed Steel. Preprints 2019, 2019070113. https://doi.org/10.20944/preprints201907.0113.v1.
Cite as:
Sun, M.; Wang, X.; Misra, R. On the Determining Role of Texture in Causing Delamination During Impact Fracture of Ti and Nb-Ti Microalloyed Steel. Preprints2019, 2019070113. https://doi.org/10.20944/preprints201907.0113.v1.
Sun, M.; Wang, X.; Misra, R. On the Determining Role of Texture in Causing Delamination During Impact Fracture of Ti and Nb-Ti Microalloyed Steel. Preprints 2019, 2019070113. https://doi.org/10.20944/preprints201907.0113.v1.
Abstract
700 MPa grade Ti and Nb-Ti microalloyed steels produced by thermo-mechanical control rolled processes (TMCP) were studied to elucidate texture that contributes to delamination and consequent impact toughness. The microstructure of Ti and Nb-Ti steels consisted of ferrite and bainite. Compared with Ti steel, Nb-Ti steel was characterized by a microstructure with finer ferrite and more bainite. The results from tensile and impact tests indicated that there is insignificant change in tensile properties, but toughness was greater in Nb-Ti steel compared with Ti steel. More severe delamination in Nb-Ti steel is attributed to stronger α-fiber (RD ||<110>) texture than Ti steel, especially {100}<110>, {113}<110> and {112}<110> texture. Typical cleavage river patterns were not observed on delaminated fracture surface, instead the cleavage fracture surface indicated some dimples. Interestingly, the impact energy of samples with delamination was greater than samples without delamination in the ductile–brittle transition region. The study suggests that delamination in the ductile–brittle transition zone may also be representative of high toughness.
Keywords
Ti and Nb-Ti microalloyed steel; microstructure; toughness; texture; delamination
Subject
MATERIALS SCIENCE, General Materials Science
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
