Abstract: In order to investigate the influence of laser power (P)， powder feeding rate (f) and scanning speed (v_f) on the macroscopic quality of cladding layers during the laser melting deposition， the orthogonal experiment was conducted to study the single pass laser cladding layer. The shape factor (ξ) was used as the evaluation index. The influence rule of P， f and v_f on the geometry morphology was concluded and the range analysis was adopted. The results indicate that f has the greatest influence on the shape factor ξ. The optimized process parameters of P， f and v_f are 1kW， 0.7g/min and 600mm/min， respectively. The superficial residual stresses in the thin-wall ring specimen of 316L by hybrid additive and subtractive manufacturing were measured by the X-ray diffraction method. The measurement results showed that the top and bottom of the samples are tensile stresses and the middle part is compressive stress. Moreover， the milling process can release part of the residual stress.

Key words: laser melting deposition(LMD), hybrid additive and subtractive manufacturing, 316L stainless steel, orthogonal experiment, macro-morphology, residual stress