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首页> 外文会议>EPD congress 2004 >DIRECTIONAL SOLIDIFICATION OF A SUPERALLOY THROUGH A PARTICULATE CERAMIC PREFORM Rui
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DIRECTIONAL SOLIDIFICATION OF A SUPERALLOY THROUGH A PARTICULATE CERAMIC PREFORM Rui

机译：通过颗粒状陶瓷预型件定向凝固超级合金Rui

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摘要

Abrasive blade tips (ABT) are sometimes used on turbine blades to increase turbine engine efficiency by decreasing gas flow past the blade tips. This research studied a potential method for producing ABT in-situ in the blade casting process. A porous alumina particulate preform was infiltrated with liquid CMSX-4 superalloy under a gas pressure of about 1 atm, and then the alloy was solidified directionally at different rates through the preform, producing a metal-matrix composite. Single crystals were achieved at cooling rates 15 C/min. Laue Xray diffraction showed that, in both monocrystalline and polycrystalline samples, the orientations of the metallic grains were unaffected by the preform and no stray grains were nucleated there.
机译：有时在涡轮机叶片上使用磨料刀片尖端（ABT），以通过减少流经叶片尖端的气流来提高涡轮发动机的效率。这项研究研究了一种在叶片浇铸过程中原位生产ABT的潜在方法。在约1atm的气压下用液体CMSX-4高温合金渗透多孔氧化铝颗粒预成型件，然后使合金以不同的速率定向地通过预成型件固化，从而产生金属基复合材料。以15℃/ min的冷却速率获得单晶。 Laue X射线衍射显示，在单晶和多晶样品中，金属晶粒的取向均不受预成型坯的影响，并且在此没有杂散晶粒成核。

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