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논문 기본 정보

자료유형
학술저널
저자정보
Mohsen Mehdizadeh (University of Tehran) Hassan Farhangi (University of Tehran)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.11
발행연도
2022.11
수록면
2,719 - 2,734 (16page)
DOI
10.1007/s12540-022-01174-z

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초록· 키워드

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In the present paper, microstructural evolutions and its effect on the mechanical properties of IN617 were investigated inas-received and worked conditions. Worked samples had been operated at 800 °C, under average working stress for operatingtimes of 65,000 and 98,000 h. The different phases were extracted by phase extraction methods. The OM, SEM, TEM,XRD, hardness, impact, stress rupture and tensile tests are used to investigate the microstructure and mechanical propertiesof operated alloys. The main phases in the specimens are M23C6and M6Ccarbides and Ti(C,N) compounds. In additionto these three compounds, γ' phase was also observed in both samples, despite the long operating time; although its volumefraction in the second sample (98,000 h) was less than the first sample (65,000 h). A very small amount of δ phase,topologically closed packed phase, was also detected in the samples. With increasing operating time, the area fraction ofcarbides increased from 0.5% in the as-received plate to 5.5% in the 98,000 h specimen. Unlike M23C6carbide, which hasan increasing trend with operating time, M6Ccarbide decreased from 25.7% in the 65,000 h sample to 18.7% in the 98,000 hsample. This decrease is attributed to the M6C+ M′ → M23C6+ M′′ reaction. The observed phases are in the form of plateshape, quasi-spherical and irregular and their dimensions increase with increasing operating time. The hardness and strengthvalues are higher in the 65,000 h sample than both the 98,000 h sample and the as-received plate. However these values inthe 98,000 h are higher than as-received plate.

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