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| Study on Tensile Property and Microstructure of Laser Cladding Repaired of 15-5PH Stainless Steel |
| LIU Haitao1, SI Chaoyang1, HUO Dengping1, ZHANG Qingrong1,YANG Donghui2 |
( 1. AVIC Xi’an Flight Automatic Control Research Institute, Xi’an 710065， China;
2. Xi’an Bright Laser Technologies LTD., Xi’an 710072， China ) |
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Abstract The affect of cladding reparation rate（25%, 50%, 75% and 100%） on mechanical property of 15-5PH
precipitation hardening stainless steel is studied. Cladding repairing samples are also used for testing fractograph, metallographic
structure, internal flaws and microstructure hardness. The results show that the tensile strength under different cladding
reparation rate is higher than the matrix; however its ductility decreases with the increase of cladding reparation rate.
Among all the studied samples, the tensile strength and mechanical property reach the peak under 25% cladding reparation
rate sample. The metallographic structures of cladding reparation area, heat-affected zone and undamaged matrix is compact.
Among them, the structure of heat-affected zone shows apparent direction, with refined grains and flawless interface
and surface. The microstructure hardness rises from cladding reparation to matrix, with peak value in heat-affected zone.
The adhesive force of cladding area is weaker than that of inner matrix. The results show that fractograph of samples all
resemble V shape.
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2017, 
