Investigation on the microstructure—mechanical property correlation in dissimilar steel welds of stainless steel SS 304 and medium carbon steel EN 8

Dilip Kumar Singh, Gadadhar Sahoo, Ritwik Basu, Vikram Sharma, M. A. Mohtadi-Bonab

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Stainless steel grade SS 304 and medium carbon steel EN 8 were welded with various combinations of weld parameters using tungsten inert gas (TIG) welding process. Significant differences in weld and interface microstructures were achieved under different weld process variables (current, voltage and speed). Microstructures of the weld region varied from large grains of γ-austenite to fine grain distribution of δ-ferrite and γ-austenite grains. Further to that, the phase boundaries between γ and δ phases showed presence of two dominant phase boundary relationships (PBR), 44°〈104〉 and 44°〈114〉. The weld metal (WM)-base metal (BM) interfaces also showed differences in the fusion zone (FZ) and heat affected zone (HAZ). Fusion zone at the interface of medium carbon steel and weld metal were characterized by presence of fine grains of ferrite which were identified as relatively strain free grains. These differences in microstructures were mainly due to the differences in heat inputs and solidification rates of the weld metal. Differences were also observed in the grain boundary fractions and local in-grain misorientation between different microstructures. The tensile strength of these welded joints were found to be clear functions of low angle grain boundary (LAGB) fractions, while impact energy was seen to be a function of austenite in-grain misorientation and δ-ferrite percentage. The pattern of fracture under tensile deformation displayed both mixed mode and ductile fracture. Differences in the fractured surfaces were seen in the distribution, size and shapes of dimples and microvoids. The present investigation attempts to address the pattern of microstructure development and the related mechanical behavior in dissimilar welded joints through a systematic approach.

Original languageEnglish
Pages (from-to)281-292
Number of pages12
JournalJournal of Manufacturing Processes
Volume36
DOIs
Publication statusPublished - 01-12-2018
Externally publishedYes

Fingerprint

Carbon steel
Welds
Stainless steel
Steel
Microstructure
Austenite
Ferrite
Phase boundaries
Metals
Grain boundaries
Fusion reactions
Inert gas welding
Carbon
Ductile fracture
Heat affected zone
Tungsten
Solidification
Tensile strength
Electric potential

All Science Journal Classification (ASJC) codes

  • Strategy and Management
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering

Cite this

Kumar Singh, Dilip ; Sahoo, Gadadhar ; Basu, Ritwik ; Sharma, Vikram ; Mohtadi-Bonab, M. A. / Investigation on the microstructure—mechanical property correlation in dissimilar steel welds of stainless steel SS 304 and medium carbon steel EN 8. In: Journal of Manufacturing Processes. 2018 ; Vol. 36. pp. 281-292.
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abstract = "Stainless steel grade SS 304 and medium carbon steel EN 8 were welded with various combinations of weld parameters using tungsten inert gas (TIG) welding process. Significant differences in weld and interface microstructures were achieved under different weld process variables (current, voltage and speed). Microstructures of the weld region varied from large grains of γ-austenite to fine grain distribution of δ-ferrite and γ-austenite grains. Further to that, the phase boundaries between γ and δ phases showed presence of two dominant phase boundary relationships (PBR), 44°〈104〉 and 44°〈114〉. The weld metal (WM)-base metal (BM) interfaces also showed differences in the fusion zone (FZ) and heat affected zone (HAZ). Fusion zone at the interface of medium carbon steel and weld metal were characterized by presence of fine grains of ferrite which were identified as relatively strain free grains. These differences in microstructures were mainly due to the differences in heat inputs and solidification rates of the weld metal. Differences were also observed in the grain boundary fractions and local in-grain misorientation between different microstructures. The tensile strength of these welded joints were found to be clear functions of low angle grain boundary (LAGB) fractions, while impact energy was seen to be a function of austenite in-grain misorientation and δ-ferrite percentage. The pattern of fracture under tensile deformation displayed both mixed mode and ductile fracture. Differences in the fractured surfaces were seen in the distribution, size and shapes of dimples and microvoids. The present investigation attempts to address the pattern of microstructure development and the related mechanical behavior in dissimilar welded joints through a systematic approach.",
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Investigation on the microstructure—mechanical property correlation in dissimilar steel welds of stainless steel SS 304 and medium carbon steel EN 8. / Kumar Singh, Dilip; Sahoo, Gadadhar; Basu, Ritwik; Sharma, Vikram; Mohtadi-Bonab, M. A.

In: Journal of Manufacturing Processes, Vol. 36, 01.12.2018, p. 281-292.

Research output: Contribution to journalArticle

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T1 - Investigation on the microstructure—mechanical property correlation in dissimilar steel welds of stainless steel SS 304 and medium carbon steel EN 8

AU - Kumar Singh, Dilip

AU - Sahoo, Gadadhar

AU - Basu, Ritwik

AU - Sharma, Vikram

AU - Mohtadi-Bonab, M. A.

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