Effect of Heat Input on Mechanical and Metallurgical Properties of Gas Tungsten Arc Welded Lean Super Martensitic Stainless Steel

• Autor(a) principal: Muthusamy,Chellappan
• Data de Publicação: 2016
• Outros Autores: Karuppiah,Lingadurai, Paulraj,Sathiya, Kandasami,Devakumaran, Kandhasamy,Raja
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Materials research (São Carlos. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392016000300572
• topic: Heat input; Lean super martensitic stainless steel; Microstructure; Mechanical properties; Fracture surface

Welding of 6mm thick AISI: 410S lean super martensitic stainless steel (LSMSS) under different heat input of 7.97, 8.75 and 10.9 kJ/cm was carried out by gas tungsten arc welding process. The influence of heat input on metallurgical and mechanical properties in weld and HAZ region was studied. The tensile tests were carried out at different temperatures, namely at room temperature, at 600ºC, 7000C and 8000C. It is observed that rise in the heat input and temperature decreased the tensile strength of the weld joint. Further it is noticed that rise in the heat input enhanced the toughness of weld deposit but hardness of weld joints showed insignificant variation in it. This was primarily due to the increase in ferrite content in the matrix of martensite by enhancement of the heat input. In general, the microstructures of weld consisted of mixture of martensite and austenite as well as some amount of ferrite. Whereas, HAZ near to the fusion line consisted of larger and more elongated bright phase of banded delta ferrite in a matrix of martensite irrespective of change in heat input.