TY - JOUR
T1 - Effect of weld on the mechanical properties of high strength and ultra-high strength steel tubes in fabricated hybrid sections
AU - Javidan, Fatemeh
AU - Heidarpour, Amin
AU - Zhao, Xiao Ling
AU - Hutchinson, Christopher R.
AU - Minkkinen, Jussi
N1 - Funding Information:
This project was supported by Australian Research Council through Discovery Projects DP1096454 and DP130100181 and DP150100442 awarded to the second and third authors and SSAB steel company for proving steel materials. Mr Yuxiang Wu of the Department of Materials Science and Engineering at Monash University is gratefully acknowledged for preparing the metallographic samples examined in part of this work and for performing the hardness profiles presented in Fig. 15 . We would also like to acknowledge Mr. Hossein Fallahi for taking SEM images using the facilities at Monash Centre for Electron Microscopy.
Publisher Copyright:
© 2016 Elsevier Ltd.
PY - 2016/7/1
Y1 - 2016/7/1
N2 - The effect of welding on the mechanical properties of high and ultra-high strength tubes in hybrid sections is a critical factor which influences the global performance of fabricated members and should be considered in the design and incorporation of these materials. To investigate and quantify these effects on the material of welded steel, a specific type of hybrid section composed of plates and tubes is considered in which two scales of experimental analysis are conducted at different positions from weld. In the macro scale, standard tensile tests are performed at various distances from weld to obtain the mechanical properties of heat affected steel in the axial direction parallel to the weld. Comparisons are made among three different welded materials: mild steel, high strength steel and ultra-high strength steel. The original and after-weld alteration in the ultimate tensile strength (UTS) and the strain corresponding to the UTS are investigated giving particular attention to the effect of yield strength and strain hardening rate. At the micro level, the microstructure of three above-mentioned materials in addition to microhardness profiles have been examined providing extensive data of the material behavior after welding. It is shown that the welding and post welding process, such as heat input and cooling rate affect the local material properties at different distances from weld leading to an overall heterogeneity in the material influencing the mechanical behavior.
AB - The effect of welding on the mechanical properties of high and ultra-high strength tubes in hybrid sections is a critical factor which influences the global performance of fabricated members and should be considered in the design and incorporation of these materials. To investigate and quantify these effects on the material of welded steel, a specific type of hybrid section composed of plates and tubes is considered in which two scales of experimental analysis are conducted at different positions from weld. In the macro scale, standard tensile tests are performed at various distances from weld to obtain the mechanical properties of heat affected steel in the axial direction parallel to the weld. Comparisons are made among three different welded materials: mild steel, high strength steel and ultra-high strength steel. The original and after-weld alteration in the ultimate tensile strength (UTS) and the strain corresponding to the UTS are investigated giving particular attention to the effect of yield strength and strain hardening rate. At the micro level, the microstructure of three above-mentioned materials in addition to microhardness profiles have been examined providing extensive data of the material behavior after welding. It is shown that the welding and post welding process, such as heat input and cooling rate affect the local material properties at different distances from weld leading to an overall heterogeneity in the material influencing the mechanical behavior.
KW - Fabricated hybrid section
KW - Heat affected zone
KW - Mechanical properties
KW - Microstructure
KW - Strain hardening rate
KW - Ultra-high strength tube
UR - http://www.scopus.com/inward/record.url?scp=84961962757&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2016.03.046
DO - 10.1016/j.engstruct.2016.03.046
M3 - Journal article
AN - SCOPUS:84961962757
SN - 0141-0296
VL - 118
SP - 16
EP - 27
JO - Structural Engineering Review
JF - Structural Engineering Review
ER -