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EFFECT OF HEAT INPUT AND SHIELDING GAS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AUSTENITIC STAINLESS STEEL 304L

E. S. Mosa, M. A. Morsy

2017enheat inputshielding gasstainless steelmicrostructuremechanical properties

Abstract

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This work investigates the effects of heat input and shielding gas composition on microstructure, ferrite number, ultimate tensile strength, hardness, and impact of austenitic stainless steels 304L. The shielding gases used in this study are pure Argon and mixture of 98% Argon (Ar) and 2% Nitrogen (N). Gas tungsten arc welding (GTAW) process was applied to weld joints. The results of the present work showed that the shielding gas composition has a significant effect on microstructure, ultimate tensile strength and hardness. Microstructure revealed changing in solidification structure from ferrite to austenite when used shielding gas 98% Ar and 2% N and revealed when heat input increased the dendrite size and inter-dendritic spacing in the weld metal also increase. The ferrite number decreased with increasing the heat input and using mixture of 98 % Ar and 2 % N. Transverse tensile test revealed that the average ultimate tensile strength (UTS) values increased with decreasing the heat input, using mixture of 98 % argon and 2 % nitrogen as shielding gas. furthermore Hardness values increased with decreasing of heat input and using shielding gas of 98 % Ar and 2% N.

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Cite This Work

@article{e8aef213-7d21-4037-87d6-0ece7b95b1b7,
  title={EFFECT OF HEAT INPUT AND SHIELDING GAS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AUSTENITIC STAINLESS STEEL 304L},
  author={E. S. Mosa and M. A. Morsy},
  year={2017},
  language={en}
}
TY  - JOUR
TI  - EFFECT OF HEAT INPUT AND SHIELDING GAS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AUSTENITIC STAINLESS STEEL 304L
AU  - E. S. Mosa
AU  - M. A. Morsy
PY  - 2017
LA  - en
ER  -

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