The Effects of Containerless HIP on the Mechanical Properties and Fracture Mode of 90W-7Ni-3Fe Heavy Alloy

The effects of containerless HIP on the mechanical properties of 90W-7Ni-3Fe alloy and the relationship between fracture mode and mechanical properties were investigated. Sub-solidus-HIP significantly improves the ductility of sintered specimens, which originally have low elongation value (10%), by a factor of 3. While it moderately improves the ductility of specimens; which originally have an elongation value of 20-25%,by a factor of 1.3~1.4.The mechanism of the HIP effect was discussed. The improvement of mechanical properties mainly attribated to the decrease of hydrogen content and improving the bonding strength between matrix-W boundaries which his confirmed after comparing with argon heat treatment and vacuum heat treatment.