Effects of Scanning Paths on Microstructure and Mechanical Properties of Wire Arc Additive Manufacture of 00Cr13Ni5Mo Alloy

The wire arc additive manufacture(WAAM) of 00Cr13Ni5Mo stainless steel was conducted based on the principle of MIG welding robot technology and rapid prototyping. The microstructure and properties of the WAAMed 00Cr13Ni5Mo deposited layer were investigated by different forming paths and heat treatments. The results show that the number of acicular martensite in 00Cr13Ni5Mo deposited layer in one-type forming path is more than that of ones in zigzag forming path, and grain boundary of austenite in one-type forming path is more obvious than that in zigzag forming path, and ferrites are precipitated from the grain boundary after 1 000℃ austenitizing treatment. The shape of the invert austenite in one-type forming path sample exhibits mostly strip and smaller than zigzag forming path sample after 600℃ tempering treatment. The micro-hardness of 00Cr13Ni5Mo stainless steel sample reaches 400~440HV and tensile strength is more than 1 200MPa in one-type forming path. The microhardness and tensile strength of the stainless steel in one-type forming path are higher than those of ones at 1 000℃ austenitizing and 600℃ tempering treatment, and their are the better than those in zigzag forming path.