50%返回料添加量再生K465合金组织特征及力学性能

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Abstract：The K465 master alloy incorporating 50% recycled material wasprepared using vacuum induction melting. The as-cast microstructure of recycled K465 aloy was investigated through optical microscopy （OM）， scanning electron microscopy （SEM）， energy dispersive spectroscopy （EDS）. The room-temperature tensile properties and high-temperature stress rupture performance after solution treatment were examined using a universaltesting machine and creep testing machine.Results indicate that recycled K465 aloywith uniform ascast microstructure，K465 alloy primarily consists of γ matrix phase channels， γ′ phase， （y+y′） eutectic phase，and carbides.Thesecarbides areMC-typecarbides rich inNb，Ti，Mo，andW.After solution treatment，therecycled alloyexhibitsa room-temperature tensilestrength of 888MPa with 7.5% elongation，and demonstratesahightemperature stress rupture life of 52.5hoursunder 975∘C/225MPa conditions.

keywords： superalloy; recycled alloy; microstructure; room-temperature mechanical properties; rupture life

1序言

高温合金按照基体元素的不同可分为铁基高温合金、镍基高温合金与钴基高温合金[1。（剩余7330字）