Abstract
Heat treatment of oscillating laser-arc hybrid welded 12Cr13 martensitic stainless steel was carried out, the microstructure and mechanical properties were studied. The results showed that sound formation was obtained without crack, pores and lack of fusion. The microstructure of the weld was mainly columnar austenite with strong texture. After heat treatment, the microstructure was coarsened but the homogeneity was improved with the grain sizes in the weld center of about 250 μm. The fractions of the high angle grain boundaries decreased while the fractions of CSL boundaries increased. After heat treatment, the strength and hardness of the weld decreased. However, the elongation and section shrinkage rate are increased by 25 % and 20 %, respectively, and the impact energy of the heat affected zone is increased from 62 J to 88 J. Finally, the effect of the oscillating laser beam on the energy distribution and molten pool flow was discussed, the effect mechanism of heat treatment on microstructure and properties of weld was illustrated, and the relationship between the microstructure and properties of the weld was established.
Published Version
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