64 0

Effect of Intercritical Annealing on Microstructure and Tensile Properties of an Ultrafine-Grained Dual-Phase Low Alloy Steel Containing Titanium

Title
Effect of Intercritical Annealing on Microstructure and Tensile Properties of an Ultrafine-Grained Dual-Phase Low Alloy Steel Containing Titanium
Author
한정호
Keywords
cold rolling; dual-phase steels; intercritical annealing; titanium; ultrafine-grained steels
Issue Date
2020-05
Publisher
WILEY-V C H VERLAG GMBH
Citation
STEEL RESEARCH INTERNATIONAL, v. 91, no. 9, article no. 2000118
Abstract
Ultrafine-grained (UFG) dual-phase (DP) AISI 5115 steel containing 0.12 wt% Ti is developed using thermomechanical treatment of cold rolling and intercritical annealing. The aim is to investigate the effect of intercritical annealing time on microstructural changes, mechanical properties, and fracture behavior. The results show that, with increasing intercritical annealing time up to 8 min, the martensite island size and the martensite volume fraction increase, whereas the ferrite grain size is not changed. Significant TiC precipitation is found inside the ferrite grains that retards grain growth during annealing. The yield strength (YS) and ultimate tensile strength (UTS) of the UFG DP steels are enhanced by increasing the martensite volume fraction, while slightly attenuated by enlarging the size of martensite islands. A suitable combination of strength and ductility is obtained in terms of the amount of energy absorbed for UFG DP steels (UTS x UE ˃ 160 MPa%) compared with the coarse-grained DP steel (approximate to 100 MPa%). The fracture mechanism of the UFG DP steel is ductile in which increasing annealing time results in a smaller average diameter of the dimples.
URI
https://onlinelibrary.wiley.com/doi/10.1002/srin.202000118https://repository.hanyang.ac.kr/handle/20.500.11754/167116
ISSN
1611-3683; 1869-344X
DOI
10.1002/srin.202000118
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE