Microstructural and mechanical characterisation of laser-welded high-carbon and stainless steel

Laser welding is becoming an important joining technique for welding of stainless steel to carbon steel and is extensively used across various sectors, including aerospace, transportation, power plants, electronics and other industries. However, welding of stainless steel to high-carbon steel is sti...

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Veröffentlicht in:International journal of advanced manufacturing technology 2015-09, Vol.80 (5-8), p.1449-1456
Hauptverfasser: Nekouie Esfahani, M. R., Coupland, J., Marimuthu, S.
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container_issue 5-8
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container_title International journal of advanced manufacturing technology
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creator Nekouie Esfahani, M. R.
Coupland, J.
Marimuthu, S.
description Laser welding is becoming an important joining technique for welding of stainless steel to carbon steel and is extensively used across various sectors, including aerospace, transportation, power plants, electronics and other industries. However, welding of stainless steel to high-carbon steel is still at its early stage, predominantly due to the formation of hard brittle phases, which undermine the mechanical strength of the joint. This study reports a scientific investigation on controlling the brittle phase formation during laser dissimilar welding of high-carbon steel to stainless steel. Attempts have been made to tailor the microstructure and phase composition of the fusion zone through influencing the alloying composition and the cooling rate. Results show that the heat-affected zone (HAZ) within the high-carbon steel has significantly higher hardness than the weld area, which severely undermines the weld quality. To reduce the hardness of the HAZ, a new heat treatment strategy was proposed and evaluated using a finite element analysis-based numerical simulation model. A series of experiments has been performed to verify the developed thermo-metallurgical finite element analysis (FEA) model, and a qualitative agreement of predicted martensitic phase distribution is shown to exist.
doi_str_mv 10.1007/s00170-015-7111-5
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subjects Aerospace industry
Avionics
Brittleness
CAE) and Design
Carbon steel
Computer simulation
Computer-Aided Engineering (CAD
Cooling rate
Electric power generation
Engineering
Finite element analysis
Finite element method
Heat affected zone
Heat treatment
High carbon steels
Industrial and Production Engineering
Industrial plants
Laser beam welding
Lasers
Martensitic stainless steels
Mathematical analysis
Mathematical models
Mechanical Engineering
Mechanical properties
Media Management
Metallurgical analysis
Microstructure
Original Article
Phase composition
Phase distribution
Power plants
Qualitative analysis
Stainless steel
Steel industry
title Microstructural and mechanical characterisation of laser-welded high-carbon and stainless steel
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