Effects of channel contour laser strategies on fatigue properties and residual stresses of laser powder bed printed maraging steel

Laser powder bed fusion is widely used for tooling applications, such as mould insert: conformal cooling channels are designed to decrease cycling time and homogenize the rate. The Achilles’ heel of additive manufacturing close surface which generate high stress concentration not machined; a result, they create weaknesses in part likely reduce lifespan mould. It necessary study impact on properties (fatigue, residual stresses, microstructure) determine optimized laser strategies porosity that may occur near contour. Residual stresses were first estimated above an internal channel after different heat treatments, fatigue specimens printed with 3-mm diameter EOS M270 printer using several contours concentric offset. these was analysed through microstructural observations. Here, it found double contour offset improved life by more than 10 times compared standard single strategy.