Analysis of Microstructures and Voids on Ductile Fracture of Ferrite/Martensite Dual-Phase Steels through Three-dimensional Observation
Year: 2020
Type: article
Abstract: This research centers on elucidating the relationship between void nucleation sites and the morphology/distribution of the surrounding phase in dual-phase steel during the initial stages of ductile fracture. Characteristic features of voids and surrounding ferrite/martensite grains were observed through a three-dimensional (3D) optical microscope analysis with the aid of serial sectioning. The characterized 3D distribution and morphology of ferrite/martensite surrounding the voids were set as an input for a finite flement (FE) simulation to obtain the hydrostatic pressure and equivalent plastic strain in the ferrite and martensite phases during tensile deformation. Experimental results showed that some of the voids present in the ferrites were surrounded by the flat-shaped martensites, which were elongated along both rolling direction (RD) and transversal direction (TD). These flat-shaped martensites were existed along the tensile direction. The FE simulation showed that the ferrite grains sandwiched between the harder martensites are more susceptible to void nucleation; this is due to the concentration of equivalent plastic strain and hydrostatic pressure in the ferrites during tensile deformation.
Source: 鐵と鋼 : 日本鐡鋼協會々誌
Authors: Mayuko Kikuzuki, Koutarou Hayashi, Yusuke Tsunemi, Shohei Yabu, Takashi Matsuno
Institutions: Nippon Steel (Japan), Tottori University
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W3022693958