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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.1
- 수록면
- 464 - 480 (17page)
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초록· 키워드
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Nano-structured oxide dispersion strengthened (ODS) steels produced from a 410L stainless steel powder prepared by wateratomizationwas studied. The infl uences of Ti content and milling time on the microstructure and the mechanical propertieswere analysed. It was found that the ODS steels made from the Si bearing 410L powder contained Y–Ti–O, Y–Ti–Si–O,Y–Si–O, and TiO 2 oxides. Most nanoparticles produced after 80 h of milling were aggregated nanoparticles; however, after160 h of milling, most aggregated nanoparticles dissociated into smaller individual nanoparticles. Perfect mixing of Y andTi was not achieved even after the longer milling time of 160 h; instead, the longer hours of milling rather resulted in Siincorporation into the Y–Ti–O rich nanoparticles and a change in the matrix morphology from an equiaxed microstructureto a tempered martensite-like microstructure. The overall micro-hardness of the ODS steel increased with the increase ofmilling time. After 80 and 160 h, the microhardnesses were over 400 HV, which primarily resulted from the fi ner dispersednanoparticles and in part to the formation of martensitic phases. Tensile strength of the 410L ODS steels was comparablewith that of ODS steel produced from gas-atomized powder.
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