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Abstract
Delta—ferritcite plays an important role in austenitic stainless steel welded joints presence of delta-ferrite with austenite reduces the probability of hot cracking improves resistance to intergranular corrosion.
This work investigates the behavior of this complex structure while under strain. In to approach this target, stainless steel samples had been welded with electrodes producing different delta-ferrite contents in the welded joints.
Tensile test specimens had been prepared and tested under tension up to a point beyond yield and before start of necking. Micrographic examination had been conducted to the joints before and after the tension test. Micro-strains had been measured in longitudinal and transverse directions and their ratio ( ) had been determined.
A study of behavior of delta—ferrite grains under strain had been carried out at cliff ferrite contents. The results indicate that higher ferrite content is more affected by s Moreover, ferrite content in weld metals increased after being subjected to plastic s Ratio () increased by using electrodes which gave higher ferrite contents in weld metals Also, the results show that dilution of weld metals at the root is higher than that at the cap this resulted in greater ferrite number at the cap than ferrite number at the root. The change of ferrite number should be taken in consideration when determining the desired f content of the weld metals.