Browse Publications Technical Papers 2018-28-0094
2018-07-09

Study of Surface Integrity and Effect of Laser Peening on Maraging Steel Produced by Laser Cusing Technique 2018-28-0094

In additive manufacturing, laser cusing is one of the selective laser melting technique. Finely pulverized metal is melted using a high-energy fibre laser, by Island principle strategy produces mechanically and thermally stable metallic components with reduced thermal gradients, stresses & at high precision. Maraging steels are having superior strength, hardness properties. Current research attempts to analyze the effect of laser shock peening on laser cused material. Surface roughness of the material was found to be increased by 8%, due to effect of laser shock pulse & ablative nature. Also 8% increase in macro hardness on the surface. Depth wise micro hardness was investigated, found to be 9% increase on the sub layer of the material due to the effect of hardened martensitic matrix formed by precipitation hardening and grain size refinement attributed by laser shock peening. Yield & Ultimate tensile strength of the laser cused material is 9% & 12% higher than that of conventionally casted maraging steel. During tensile test, crack initiation occurred nearly at 450, 21 % percentage elongation, 36 mm2 reduction in area. Obviously in fractographic analysis ductile mode failure is noticed, owing to the dispersive distribution of dimples and micro voids in the microstructure.

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