Process for identification, evaluation and removal of microshrinkage |
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| 申请号 | JP7707091 | 申请日 | 1991-03-18 | 公开(公告)号 | JPH04228259A | 公开(公告)日 | 1992-08-18 |
| 申请人 |
General Electric Co |
发明人 | PIITAA UORUTAA MIYURAA; TOOMASU FUREDERITSUKU BERII; ROBAATO YUUJIN AREN; KURISUTOFUAA CHIYAARUSU GURIN; RARII ROJIYAA SAAMONSU; | ||||
| 摘要 | PURPOSE: To provide a process for identifying, evaluating and removing the microsrhinkage of investment cast superalloy parts and the parts produced by this process. CONSTITUTION: The parts which do not have the detrimental microsrhinkage and enable the longer life at the existing stress level or are usable at a higher repetitive stress are produced in this process. For this purpose, the parts are first subjected to a hot isostatic pressing treatment, by which the microsrhinkage under the surface not communicating with the front surface is removed. Next, the parts are immersed into an acid soln. for the time sufficient for uniformly removing at least about 0.005 inch on the initial cast surface in order to microscopically expose the microsrhinkage near the surface communicating with the front surface. The thus exposed microsrhinkage is evaluated as to be permissible or to be removed by a standard non-destructive inspection method. COPYRIGHT: (C)1992,JPO |
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