Effect of SS-316L and nickel-based interface powders on joint characteristics of microwave welded SS-316L plates

Abstract

Microwave energy has been exploited as a rapid and volumetric heating source in various manufacturing applications, such as microwave joining. This study used stainless steel (SS-316L) plates to be microwave-joined at 2.45 GHz. The microwave hybrid heating (MHH) technique was used to prepare joints inside a microwave applicator using nickel-based (EWAC 1004EN) and SS-316L interfacing powders at 900 W. Microstructural and mechanical characterizations of the developed joints were performed to understand the effect of the interface powder on weld quality. Microstructural observations revealed adequate metallurgical bonding between interfacing powders and bulk metal with columnar and dendritic grains (EWAC-based joint) and equiaxed grains (SS-316L-based joint). The phase analysis revealed the presence of intermetallic phases such as iron-nickel, chromium carbide, and chromium iron carbide in EWAC-based joint and iron-nickel, nickel-chromium, and chromium carbide in SS-316L-based joint, which contribute to enhanced joint microhardness compared to base alloys. A larger grain size, more low-angle boundaries, and higher misorientation angles were found in the EWAC-based joint. Furthermore, the average ultimate tensile strength of SS-316L-based joints was 26% higher, with a 6.9% enhanced elongation, than that of EWAC-based joints. The EWAC-based joint exhibited better corrosion resistance than that of SS-316L-based joint.

Keywords

Microwave joining nickel-based powder stainless steel electron back scattered diffraction characterization tensile strength corrosion

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References

Fontana

Penasa

. Autogenous laser welding of austenitic stainless steel to copper alloy. Sci Technol Weld Joining 1998; 3(2): 81–87.

Jun

Park

Cheepu

, et al. Observation and analysis of metal transfer phenomena for high-current super-TIG welding process. Sci Technol Weld Joining 2020; 25(2): 106–111.

Youn

Kim

Miura

. thermal aging effect on fracture toughness of GTAW/SMAW of 316L stainless steel: experiments and applicability of existing CASS models. Nucl Eng Technol 2021; 53(4): 1357–1368.

Alali

Todd

Wynne

. Through-thickness microstructure and mechanical properties of electron beam welded 20 mm thick AISI 316L austenitic stainless steel. Mater Des 2017; 130: 488–500.

Buddu

Chauhan

Raole

. Mechanical properties and microstructural investigations of TIG welded 40 mm and 60 mm thick SS 316L samples for fusion reactor vacuum vessel applications. Fusion Eng Des 2014; 89(12): 3149–3158.

Hemmer

Grong . Prediction of penetration depths during electron beam welding. Sci Technol Weld Joining 1999; 4(4): 219–225.

Fan

Shen

Zhang

, et al. Microstructure and mechanical properties of similar and dissimilar joints of RAFM and 316L by electron beam welding. Fusion Eng Des 2021; 162: 112130.

Das

Fritz

Finuf

, et al. Blue laser welding of multi-layered AISI 316L stainless steel micro-foils. Opt Laser Technol 2020; 132: 106498.

Javadi

Smith

Abburi Venkata

, et al. residual stress measurement round robin on an electron beam welded joint between austenitic stainless steel 316L(N) and ferritic steel p91. Int J Press Vessel Piping 2017; 154: 41–57.

10.

Huang

, et al. Stress and distortion of the 10 mm thick plate EH40 and 316L different butt joints in 10 kW laser welding. Opt Laser Technol 2022; 152: 108179.

11.

Srinath

Sharma

Kumar

. A new approach to joining of bulk copper using microwave energy. Mater Des 2011; 32(5): 2685–2694.

12.

Singh

Gupta

Jain

. Recent applications of microwaves in materials joining and surface coatings. Proc IMechE, Part B: J Engineering Manufacture 2016; 230(4): 603–617.

13.

Mishra

Sharma

. A review of research trends in microwave processing of metal-based materials and opportunities in microwave metal casting. Crit Rev Solid State Mater Sci 2016; 41(3): 217–255.

14.

Singh

Gupta

, et al. Development and characterization of microwave processed cast iron joint. Eng Sci Technol Int J 2019; 22(2): 569–577.

15.

Bansal

Sharma

Das

, et al. Characterization of microstructure and strength of microwave welded Inconel 718 joints at 2.45 GHz frequency. Kovove Materialy 2016; 54(01): 27–35.

16.

Bansal

Sharma

Kumar

, et al. Characterization of bulk stainless steel joints developed through microwave hybrid heating. Mater Charact 2014; 91: 34–41.

17.

Badiger

Narendranath

Srinath

. Microstructure and mechanical properties of Inconel-625 welded joint developed through microwave hybrid heating. Proc IMechE, Part B: J Engineering Manufacture 2018; 232(14): 2462–2477.

18.

Bansal

Sharma

Kumar

, et al. Structure–property correlations in microwave joining of Inconel 718. Jom 2015; 67(9): 2087–2098.

19.

Sahota

Bansal

Kumar

. Microwave butt joining of stainless steel (SS-316L) with an SS-316L powder. Trans Indian Ins Metals 2023; 76(12): 3303–3312.

20.

Srinath

Sharma

Kumar

. A novel route for joining of austenitic stainless steel (SS-316) using microwave energy. Proc IMechE, Part B: J Engineering Manufacture 2011; 225(7): 1083–1091.

21.

Bansal

Sharma

Kumar

, et al. Investigation on microstructure and mechanical properties of the dissimilar weld between mild steel and stainless steel-316 formed using microwave energy. Proc IMechE, Part B: J Engineering Manufacture 2016; 230(3): 439–448.

22.

Bhandari

Gupta

Mishra

, et al. On microstructural and mechanical properties of 21-4-N nitronic steel joint developed using microwave energy. J Micromanuf 2023; 6: 18.

23.

Badiger

Narendranath

Srinath

, et al. Effect of power input on metallurgical and mechanical characteristics of Inconel-625 welded joints processed through microwave hybrid heating. Trans Indian Ins Metals 2019; 72(3): 811–824.

24.

Gamit

Mishra

Sharma

. Joining of mild steel pipes using microwave hybrid heating at 2.45 GHz and joint characterization. J Manuf Process 2017; 27: 158–168.

25.

Bagha

Sehgal

Thakur

, et al. Effects of powder size of interface material on selective hybrid carbon microwave joining of SS304–SS304. J Manuf Process 2017; 25: 290–295.

26.

Reddy

KVB

Venkatesh

Mishra

. Microwave joining of SS-316 plates: a multi-physics simulation study. J Manuf Process 2023; 98: 29–41.

27.

Gupta

Sharma

. Development and microstructural characterization of microwave cladding on austenitic stainless steel. Surf Coat Technol 2011; 205(21–22): 5147–5155.