Effect of Ti-6Al-4V Alloy Addition on the Microstructure and Mechanical Properties of 15-5PH Stainless Steel Prepared by In Situ Alloying Additive Manufacturing
Effect of Ti-6Al-4V Alloy Addition on the Microstructure and Mechanical Properties of 15-5PH Stainless Steel Prepared by In Situ Alloying Additive Manufacturing
The effects of different Ti-6Al-4V alloy powder additions on the microstructure and mechanical properties of 15-5PH stainless steel prepared by in situ alloying additive manufacturing were investigated.The grain refinement and toughness mechanisms were analyzed by optical microscope,electron back scatter diffraction,X-ray diffraction,scanning electron microscope fracture analysis and tensile experiments.The results show that the microstructure of 15-5PH stainless steel changed after in situ alloying with Ti-6Al-4V alloy,which significantly refines the grain size while reducing the texture strength.And the dislocation density is reduced by inhibiting the martensite phase transition.The yield strengths of 15-5PH+0.8％Ti-6Al-4V and 15-5PH+1.6％Ti-6Al-4V alloy reached 1 069 MPa and 1 021 MPa respectively,which are much higher than those of 15-5 PH stainless steel(680 MPa).Meanwhile,the elongation of the in situ alloying alloys increases significantly.The higher yield strength and elongation are mainly due to grain refinement and the decrease in dislocation density.
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