CAJ | 학술논문

某现役批产发动机工厂试车后，渗透检验发现多件高涡叶片位于叶冠堆焊耐磨层热影响区存在超标裂纹显示；同时工艺在生产中也出现了大批因同样裂纹超标而报废的高涡叶片。通过对故障叶片进行金相组织检查、扫描电镜断口分析，确定了故障性质为焊接热影响区液化裂纹，并为解决这一严重制约工艺生产的技术瓶颈，开展了一系列工艺试验和验证分析工作。经优化铸造工艺、调整焊接工艺、增加水冷夹具，并重新疏理了焊接检验方法和缺陷判定标准，最终解决了制约高涡叶片生产试车的技术难题，经后续生产的2000余件高涡叶片耐磨层一次焊接合格率提升至95%以上，并连续跟踪高涡叶片外场使用情况未发现任何耐磨层质量问题。
모현역비산발동궤공엄시차후，삼투검험발현다건고와협편위우협관퇴한내마층열영향구존재초표렬문현시；동시공예재생산중야출현료대비인동양렬문초표이보폐적고와협편。통과대고장협편진행금상조직검사、소묘전경단구분석，학정료고장성질위한접열영향구액화렬문，병위해결저일엄중제약공예생산적기술병경，개전료일계렬공예시험화험증분석공작。경우화주조공예、조정한접공예、증가수랭협구，병중신소리료한접검험방법화결함판정표준，최종해결료제약고와협편생산시차적기술난제，경후속생산적2000여건고와협편내마층일차한접합격솔제승지95%이상，병련속근종고와협편외장사용정황미발현임하내마층질량문제。
After the active batch - production aero - engine ran the ground test,the HAZ cracks were found on high pressure turbine shroud surfaces through penetrant inspection. Simultaneous lots of blades were rejected in production because of the cracks. This paper discussed the formation mechanism of the cracks by means of metallographic,fracture scanning analysis. The results showed that there were liquation cracks in the HAZ,so that a series of process tests were developed to prevent from the cracks,including the tests of casting process,welding process,cooling fixture,inspection measure and defect definition. In result,the technique problem was fig-ured out,that the first - time qualified rate of the blade shroud hard - facing was raised to 95% throughout two thousands blades,and no quality problem was found in use.