无包套热等静压对于重合金90W-7Ni-3Fe机械性能和断裂模式的影响
The Effects of Containerless HIP on the Mechanical Properties and Fracture Mode of 90W-7Ni-3Fe Heavy Alloy
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摘要: 本文考察了无包套热等静压对于合金90W-7Ni-3Fe机械性能的影响以及断裂模式和机械性能之间的关系。亚固相线热等静压使具有低延伸率(<10%)烧结试样的延性显著改善(为原来的3倍)。对于具有延伸率20~25%的烧结试样,则可以在一定程度上予以改善(为原来的1.3~1.4倍)。本文探讨了热等静压对于重合金作用的机制。机械性能的改进主要归因于氢含量的降低和基体-钨晶粒间界结合强度的提高,这是通过与氩热处理以及真空热处理的对比而确定的。Abstract: 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.
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