Issue |
Metall. Res. Technol.
Volume 120, Number 2, 2023
|
|
---|---|---|
Article Number | 206 | |
Number of page(s) | 7 | |
DOI | https://doi.org/10.1051/metal/2023018 | |
Published online | 08 March 2023 |
Original Article
Investigation of cold cracking resistance of HSLA 950A steel by taguchi optimization technique
1
Department of Mechanical Engineering, Kumaraguru College of Technology, Coimbatore 641 049, India
2
Department of Mechanical Engineering, SNS College of Technology, Coimbatore 641 107, India
3
NDT & Metallurgy Group, CSIR-Central Mechanical Engineering Research Institute, MG Avenue, Durgapur 713209, India
* e-mail: chidambaramselva@gmail.com
Received:
30
August
2022
Accepted:
1
February
2023
Cold cracking is one of the major issues during welding High Strength Low Alloy (HSLA) 950A steel. The aim of the present research work is to optimize preheating temperature, the addition of oxide particles, and heat input using the Taguchi design of experiments for bead on plate, especially on the improved impact strength of weld metal. The experiments are carried out at three levels of mentioned parameters and Charpy impact strength is considered as a response. L27 orthogonal array is selected for experimentation in the present investigation using three parameters. An addition of vanadium oxide (V2O5) has acted as a nucleation site for acicular ferrite and enhanced the cold cracking resistance of investigated steel. The experimental results suggested that the impact strength of weldment is strongly influenced by pre-heating temperature (74.5%) and less influenced by oxide particle concentration (12.7%), and heat input (12.2%). Microstructure at HAZ revealed the presence of a small proportion of acicular ferrite of Widmanstatten morphology and upper bainite near weldment causes the reason for enhancement in cold cracking resistance. Fractographic examination revealed the presence of both ductile and brittle fracture modes, which attributed to higher and lower impact strength of weld joint respectively.
Key words: Pre-heating / heat input / cold cracking / acicular ferrite / impact strength
© EDP Sciences, 2023
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