[논문]Cr-Mo 저합금강의 진공침탄 공정 압력 및 질소 첨가 비율에 따른 경화깊이 균일도 및 표면 특성 효과

권기훈; 박현준; 안기원; 이영국; 문경일

doi:10.5695/jsse.2023.56.1.94

Cr-Mo 저합금강의 진공침탄 공정 압력 및 질소 첨가 비율에 따른 경화깊이 균일도 및 표면 특성 효과
Effect of process pressure and nitrogen addition ratio on the uniformity of hardening depth and surface properties of Cr-Mo low alloy steel in vacuum carburizing 원문보기

한국표면공학회지 = Journal of the Korean institute of surface engineering, v.56 no.1, 2023년, pp.94 - 103

권기훈 (한국생산기술연구원 친환경열표면처리연구부문) , 박현준 (한국생산기술연구원 친환경열표면처리연구부문) , 안기원 (한국생산기술연구원 친환경열표면처리연구부문) , 이영국 (연세대학교 신소재공학과) , 문경일 (한국생산기술연구원 친환경열표면처리연구부문)

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The effects of carburizing pressure and gas ratio on vacuum carburizing properties (uniformity and surface characteristics) have been studied through the analyses of carbon concentration, hardness, surface color, surface roughness and type of carbon bonding. AISI 4115 steel specimens were carburized with various pressures (1, 5, and 10 Torr) at different locations (P1, P2, P3, P4, P5, and P6) inside a furnace held at 950 ℃. Since the carburizing pressure represents the density of the carburizing gas, it plays an important role in improving the carburizing uniformity according to locations in the furnace. As the carburizing pressure increased, the carburizing uniformity according to the sample location was improved, but the surface of the carburized specimen was discolored due to the residual acetylene gas, which does not contribute to the carburizing reaction. Therefore, the carburizing uniformity and surface discoloration have been improved by injecting acetylene gas (carburizing gas) and nitrogen gas (non-reactive gas) in a specific ratio.

주제어

표/그림 (19)

그림 Fig. 1. Carbon flux and surface properties according to acetylene flow rates.
그림 Fig. 3. Schematic diagram of vacuum carburizing process for AISI 4115 steel, used in this study.
그림 Fig. 2. Schematic diagram of specimen arrangement in vacuum carburizing process used in this study.
표 Table 1. Chemical composition of AISI 4115 (wt%)
표 Table 2. Flow rate ratio of acetylene and nitrogen.
그림 Fig. 4. Temperature distribution in the heat chamber according to the charging position.
그림 Fig. 5. Carbon concentration-depth profiles of the as-carburized specimens according to locations in the furnace: (a) 1 Torr; (b) 5 Torr; (c) 10 Torr.
그림 Fig. 6. Microvickers hardness-depth profiles of the as-carburized specimens according to locations in the furnace: (a) 1 Torr; (b) 5 Torr; (c) 10 Torr.
그림 Fig. 7. Surface color of the carburized specimen according to the process pressure: (a) 1 Torr; (b) 5 Torr; (c) 10 Torr.
그림 Fig. 8. Schematic diagram of carburizing atmosphere according to process pressure and nitrogen addition.
그림 Fig. 9. Carburizing properties according to nitrogen flow rate at 1 Torr.
표 Table 3. Surface color and carburizing characteristics according to gas ratio. (1 Torr)
그림 Fig. 10. Carburizing properties according to nitrogen flow rate at 5 Torr.
그림 Fig. 11. Carburizing properties according to nitrogen flow rate at 10 Torr.
표 Table 4. Surface color and carburizing characteristics according to gas ratio. (5 Torr)
표 Table 5. Surface color and carburizing characteristics according to gas ratio. (10 Torr)
그림 Fig. 12. Transversal metallographic pictures of the carburized specimen according to nitrogen flow rate at 10 Torr. (left: no nitrogen, center: 10 sccm N₂, right: 15 sccm N₂)
그림 Fig. 13. Measurement depth analysis of soot deposited according to nitrogen flow rate at 10 Torr.
그림 Fig. 14. Raman spectroscopy of the carburized specimens according to nitrogen flow rate at 10 Torr.

참고문헌 (15)

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