This study investigates the influences of brazing temperature, brazing time and braz- ing clearance on microstructures and high temperature strength of Inconel superalloy. Bonding is performed in a high vacuum furnace...This study investigates the influences of brazing temperature, brazing time and braz- ing clearance on microstructures and high temperature strength of Inconel superalloy. Bonding is performed in a high vacuum furnace using BNi-2 as filler metal. Brazing temperatures employed in this study are 1080 ℃, 1110 ℃ and 1140 ℃. Holding times at the brazing temperature are 5 min, 15 min and 45 min. At the same time, the investigated brazing clearances are 30μm, 60 μm and 100 pro. Microstructure of the brazed joints is analyzed by means of metallography, scanning electron microscope （SEM）. The high temperature tensile strength and microhardness are evaluated at different brazing parameters. The results show that fracture occurs wholly within the braze metal. Deformation appears to be confined to the braze metal with the base metal, showing very little plastic deformation. Brazing time shows to play the important role in the brazing parameters. The peak of microhardness is at the centerline of braze region. Induction heating has little effect on the base materials.展开更多
A commercially available Ti47Zr2sCu14Nin （at. pct） amorphous filler foil was used to join ZrO2 ceramic and Ti-6A1-4V alloy. According to experimental observations, the interface microstructure accounts for the mecha...A commercially available Ti47Zr2sCu14Nin （at. pct） amorphous filler foil was used to join ZrO2 ceramic and Ti-6A1-4V alloy. According to experimental observations, the interface microstructure accounts for the mechanical properties of the joints. The effects of brazing conditions and parameters on the joint properties were investigated. The joint shear strength showed the highest value of about 108 MPa and did not monotonously increase with the brazing time increasing. It was shown that decreasing of brazing cooling rate and appropriate filler foil thickness gave higher joint strength.展开更多
基金supported by the National Natural Science Foundation of China(No.50875160)Shanghai Leading Academic Discipline Project (No.J51402)Natural Science Foundation of Shanghai of China (No.10ZR1412900)
文摘This study investigates the influences of brazing temperature, brazing time and braz- ing clearance on microstructures and high temperature strength of Inconel superalloy. Bonding is performed in a high vacuum furnace using BNi-2 as filler metal. Brazing temperatures employed in this study are 1080 ℃, 1110 ℃ and 1140 ℃. Holding times at the brazing temperature are 5 min, 15 min and 45 min. At the same time, the investigated brazing clearances are 30μm, 60 μm and 100 pro. Microstructure of the brazed joints is analyzed by means of metallography, scanning electron microscope （SEM）. The high temperature tensile strength and microhardness are evaluated at different brazing parameters. The results show that fracture occurs wholly within the braze metal. Deformation appears to be confined to the braze metal with the base metal, showing very little plastic deformation. Brazing time shows to play the important role in the brazing parameters. The peak of microhardness is at the centerline of braze region. Induction heating has little effect on the base materials.
基金supported by 2009 Open Foundation of the Key Lab of Automobile Materials, Jilin University, from Natural Scientific Basic Research Fund for Platform and Base Construction (Grant No. 09-421060352467)the Depart-ment of Science & Technology of Jilin Province of China (Grant No. 20100545)
文摘A commercially available Ti47Zr2sCu14Nin （at. pct） amorphous filler foil was used to join ZrO2 ceramic and Ti-6A1-4V alloy. According to experimental observations, the interface microstructure accounts for the mechanical properties of the joints. The effects of brazing conditions and parameters on the joint properties were investigated. The joint shear strength showed the highest value of about 108 MPa and did not monotonously increase with the brazing time increasing. It was shown that decreasing of brazing cooling rate and appropriate filler foil thickness gave higher joint strength.
