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Evolution of Microstructure and Texture in UNS S32750 Super Duplex Stainless Steel Weldments

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Abstract

Super duplex stainless steel (UNS S32750) butt joints were prepared using ER2594 and ER2595 electrodes by shielded metal arc welding (SMAW) process. The heat input used during welding was in the range of 0.75–0.81 kJ/mm. Microstructure and texture across the weldments were investigated using optical microscope, scanning electron microscope, and electron backscattered diffraction. The solidification mode in the fusion zone (FZ) was found to be ferritic, and the microstructure mainly consisted of Widmanstatten austenite (WA), grain boundary austenite (GBA), and inter-granular austenite (IGA). The base metal (BM) had ~ 50% ferrite and 50% austenite. The ferrite proportion changed significantly in FZ and heat-affected zone (HAZ) after welding. Austenite in the BM showed strong Brass ({110} < 112 >), Cu ({112} < 111 >), Goss ({110} < 110 >), and S ({123} < 634 >) components, while ferrite showed strong α (RD// < 110 >) and γ (ND// < 111 >) fibres. The texture of ferrite was stronger than that of austenite. The austenite and ferrite in the FZ (cap pass) obeyed Kurdjumov–Sachs (K–S) orientation relationship. Further, the hardness of ER2595 weldments was found to be higher than that of ER2594 weldments.

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Acknowledgment

The authors are thankful to Director, VNIT Nagpur, for providing necessary facilities and constant encouragement to publish this paper. The authors would like to acknowledge the use of National Facility for Texture and OIM (A DST-IRPHA project), IIT, Bombay for EBSD measurements.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), South Ambazari Road, Nagpur, Maharashtra, 440010, India

    Tushar Ramdas Dandekar, Aman Gupta & Rajesh Kisni Khatirkar

  2. Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India

    Ranjeet Kumar

  3. Weldfast Electrodes Pvt. Ltd, D-57-59, Hingna Industrial Area, MIDC, Nagpur, Maharashtra, 440016, India

    Ashvin D. Gaikwad

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  1. Tushar Ramdas Dandekar
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  2. Aman Gupta
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  3. Rajesh Kisni Khatirkar
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  4. Ranjeet Kumar
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  5. Ashvin D. Gaikwad
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Correspondence to Rajesh Kisni Khatirkar.

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Dandekar, T.R., Gupta, A., Khatirkar, R.K. et al. Evolution of Microstructure and Texture in UNS S32750 Super Duplex Stainless Steel Weldments. Trans Indian Inst Met 74, 2267–2283 (2021). https://doi.org/10.1007/s12666-021-02274-x

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  • DOI: https://doi.org/10.1007/s12666-021-02274-x

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