Mechanical and micro-structural studies of pulsed and constant current TIG weldments of super duplex stainless steels and Austenitic stainless steels

Author:

Yelamasetti Balram1,Karuna B. N. R.2,Vishnu Vardhan T.3,Dasore Abhishek4,Saxena Kuldeep K.5,Faroque Firoz Alam6,Revathi V.7,Abduvalieva Dilsora8

Affiliation:

1. Department of Mechanical Engineering, MLR Institute of Technology , Dundigal , Hyderabad 500043, Telangana , India

2. Departmentment of Mathematics, Koneru Lakshmaiah Education Foundation , Hyderabad 500043, Telangana , India

3. Department of Mechanical Engineering, Sri Venkateswara Institute of Technology , Ananthapuram 515722, Andhra Pradesh , India

4. Department of Mechanical Engineering, Koneru Lakshmaiah Education Foundation , Vaddeswaram , 522302, Guntur, Andhra Pradesh , India

5. Division of Research and Development, Lovely Professional University , Phagwara , India

6. Department of Civil Engineering, Manipal Institute of Technology Bengaluru, Manipal Academy of Higher Education , Karnataka , India

7. Department of Applied Sciences, New Horizon College of Engineering , Bangalore , India

8. Department of Mathematics and Information Technologies, Tashkent State Pedagogical University , Bunyodkor Avenue, 27 , Tashkent 100070 , Uzbekistan

Abstract

Abstract In the present research work, the influence of heat input rates on microstructures, hot tensile properties, and weld surface hardness number of Super Duplex Stainless Steel 2507 super duplex steels and austenitic steels 316L plates were investigated. Pulsed current and constant current modes were used in Tungsten Inert Gas (TIG) welding to join the dissimilar metals using ER2205 as filler. Microstructural studies were revealed at different zones of pulsed and constant current TIG weldments using optical microscopy. The tensile test was conducted at two different temperature conditions (i.e., 27 and 350°C) to investigate the strength of dissimilar weldments. Hardness measurements were made on the weld surface along the transverse direction using Vicker’s hardness tester. The microstructures revealed the formation of inter-granular austenite at the fusion zone with grain boundaries with austenite structures. Due to the constant heat input, a significant microstructural development with high austenite fractions was observed in constant current (CC)-TIG weldment. In comparison to CC-TIG weldments (UTS at 27°C = 600 MPa UTS at 350°C = 456 MPa), higher tensile characteristics were noted in Pulsed Current (PC)-TIG weldments (UTS at 27°C = 695 MPa UTS at 350°C = 475 MPa). The UTS of PC-TIG weldment is improved by 15.8% when compared to CC-TIG weldment due to the controlled heat input rates. PC-TIG weldments exhibited improved hardness numbers in various zones with smaller HAZ widths than CC-TIG weldments.

Publisher

Walter de Gruyter GmbH

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