Open AccessFracture behavior of a one-step quenching and partitioning steel characterized using uniaxial tension and double edge-notched tension
Author(s) -
Bo Sun,
Zhiping Xiong
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1653/1/012023
Subject(s) - materials science , martensite , lath , lamellar structure , composite material , bainite , tension (geology) , austenite , fracture (geology) , ferrite (magnet) , quenching (fluorescence) , nucleation , metallurgy , ultimate tensile strength , microstructure , physics , chemistry , organic chemistry , quantum mechanics , fluorescence
The fracture behavior was characterized using uniaxial tension and double edge notched tension (DENT) in a one-step quenching and partitioning steel. This steel consisted of lamellar matrix (tempered martensite and bainitic ferrite lath) together with dispersed blocky and film RA/M (retained austenite and/or fresh martensite). Lamellar structure promoted trans-lath fracture; whereas, blocky RA/M island contributed to ductile fracture in uniaxial tension but induced brittle fracture in DENT test because a higher stress triaxiality in the latter enhanced the rate of martensite transformation and in turn boosted early crack nucleation and propagation.