Fatigue Crack Growth Behavior of Gas Metal Arc Welded AISI 409 Grade Ferritic Stainless Steel Joints |
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Authors: | AK Lakshminarayanan K Shanmugam V Balasubramanian |
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Affiliation: | (1) Department of Manufacturing Engineering, Centre for Materials Joining & Research (CEMAJOR), Annamalai University, Annamalai Nagar, 608 002, Tamil Nadu, India; |
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Abstract: | The effect of filler metals such as austenitic stainless steel, ferritic stainless steel, and duplex stainless steel on fatigue
crack growth behavior of the gas metal arc welded ferritic stainless steel joints was investigated. Rolled plates of 4 mm
thickness were used as the base material for preparing single ‘V’ butt welded joints. Center cracked tensile specimens were
prepared to evaluate fatigue crack growth behavior. Servo hydraulic controlled fatigue testing machine with a capacity of
100 kN was used to evaluate the fatigue crack growth behavior of the welded joints. From this investigation, it was found
that the joints fabricated by duplex stainless steel filler metal showed superior fatigue crack growth resistance compared
to the joints fabricated by austenitic and ferritic stainless steel filler metals. Higher yield strength and relatively higher
toughness may be the reasons for superior fatigue performance of the joints fabricated by duplex stainless steel filler metal. |
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