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Effect of microstructure and chemical composition on cold crack susceptibility of high-strength weld metal

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Abstract

The effects of the microstructural constituents, chemical composition, and retained austenite on high-strength weld metal were studied using preheat-free steels and GMAW solid wires with a low hydrogen content. The cold cracking susceptibility of these GMAW wires was evaluated using the y-groove Tekken test. The results showed that acicular ferrite produced the greatest resistance to cold cracking and that the microstructure of the deposit was more important than the hardness and diffusible hydrogen content in low-hydrogen weld metal. Crack blunting and branching occurred when a crack propagated through fine acicular ferrite because of the fine interlocking nature of the microstructure. Alloying elements for nucleating acicular ferrite, such as Ti, Al, and V, are required for proper austenite grain size, and sequence of inclusion formation was identified in the present paper. Furthermore, the retained austenite was not found to play the role of a hydrogen trapping site and so had no effect on the cold cracking susceptibility at a low preheating temperature (≤100°C) and low heat input (≤1.5 KJ/mm) to the weld metal.

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Authors and Affiliations

  1. School of Mechanical Engineering, Pusan National University, Busan, 609-735, Korea

    Hui-Jun Yi, Yong-Jun Lee, Jong-Yun Kim & Sung-Su Kang

Authors
  1. Hui-Jun Yi
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  2. Yong-Jun Lee
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  3. Jong-Yun Kim
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  4. Sung-Su Kang
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Correspondence to Hui-Jun Yi.

Additional information

This paper was recommended for publication in revised form by Associate Editor Vikas Tomar

Hui-Jun Yi received his M.S. degree from Graduate School of Pusan National University, Korea. He is currently in the doctoral course of Graduate School of Pusan National University, Korea. Mr. Yi’s research interests include weldability of ferrous and nonferrous metals and CAE for predicting welding residual stress and distortion.

Yong-Jun Lee received his M.S. degree from Graduate School of Pusan National University, Korea. He is currently in the doctoral course of the Graduate School of Pusan National University, Korea. Mr. Lee’s research interests include laser welding and CAE for predicting fatigue life.

Jong-Yun Kim received his B.S. in Mechanical Engineering from Pusan National University, Korea. He is currently in the master’s course of the Graduate School of Pusan National University, Korea. Mr. Kim’s research interests include friction stir welding and fatigue life of stainless steel weldment.

Sung-Su Kang received his M.S. and Ph.D. degrees from Graduate School of Seoul National University, Korea. He is currently a Professor at the School of Mechanical University at Pusan National University in Pusan, Korea. Dr. Kang’s research interests include plastic working process and CAE for plastic working.

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Yi, HJ., Lee, YJ., Kim, JY. et al. Effect of microstructure and chemical composition on cold crack susceptibility of high-strength weld metal. J Mech Sci Technol 25, 2185–2193 (2011). https://doi.org/10.1007/s12206-011-0529-2

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  • DOI: https://doi.org/10.1007/s12206-011-0529-2

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