개량형 C95600 청동의 기계적 성질과 미세조직에 미치는 퀜칭 열처리의 영향
Effect of Quenching Heat-treatment on Mechanical Properties and Microstructure of Modified C95600 Bronze
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Modified C95600 bronze contains Fe component of 0.7 weight percentage besides Cu-7Al-2.5Si composition. The shape of centrifugal cast is a circular pipe with thick wall. Specimens machined from the centrifugal cast were quenched in oil after isothermal holding at a given heat treatment temperature in the range of 700~900℃. Mechanical properties and structural morphology are depended on the quenching heat treatment temperature regardless of isothermal holding time. Tensile strength or Brinell hardness is increased with increasing heat treatment temperature. The microstructure caused by quenching contains mixing phases of α＋β´＋ FeSi＋κ, which martensite of β' phase has been transformed from β phase. Effect of isothermal holding temperature on mechanical properties in case of quenching heat treatment attributes to the change of volume fraction of β' on the structural morphology. Mechanical characteristics of specimen, initially quenched from 850℃, and then tempered at 500℃, does not show an obvious softening indication, because disappearance of β' during tempering process can be compensated by precipitation of brittle phase γ.
Abstract
Modified C95600 bronze contains Fe component of 0.7 weight percentage besides Cu-7Al-2.5Si composition. The shape of centrifugal cast is a circular pipe with thick wall. Specimens machined from the centrifugal cast were quenched in oil after isothermal holding at a given heat treatment temperature in the range of 700~900℃. Mechanical properties and structural morphology are depended on the quenching heat treatment temperature regardless of isothermal holding time. Tensile strength or Brinell hardness is increased with increasing heat treatment temperature. The microstructure caused by quenching contains mixing phases of α＋β´＋ FeSi＋κ, which martensite of β' phase has been transformed from β phase. Effect of isothermal holding temperature on mechanical properties in case of quenching heat treatment attributes to the change of volume fraction of β' on the structural morphology. Mechanical characteristics of specimen, initially quenched from 850℃, and then tempered at 500℃, does not show an obvious softening indication, because disappearance of β' during tempering process can be compensated by precipitation of brittle phase γ.
참고문헌 (9)
- ASM, "Properties and Selection: Nonferrous Alloys and Special-Purpose Materials", ASM International, 2, pp.386~ (1991)
- ASTM B 148, "Standard Specification for Aluminum- Bronze Sand Castings", pp.247~252 (1992), ASTM
- Cenoz, I, "Phase Transformations in Cu-Al Alloy", Metal Science and Heat Treatment, 53(5-6), pp.265~269 (2011)
- Davis, J.R, "Copper and Copper Alloys", ASM International, pp.46~53 (2001)
- Kondrat'ev, S. Yu, "Effect of Silicon on the Mechanical Properties and Damping Capacity of Two-Phase Aluminum Bronzes in the Hardened State", Problemy Prochnosti, 9(3), pp.107~109 (1980)
- Swann, P.R, "The Electron- Metallography and Crystallography of Copper-Aluminum Martensites", Acta Metallurgica, 11(7), pp.511~527 (1963)
- Villars, P, "Handbook of Ternary Alloy Phase Diagrams", ASM International, 3, pp.3330~9454 (1995)
- 권오양, "Cu-Al 합금의 현미경조직과 기계적 성 질에 미치는 Si의 영향", 대한금속학회지, 16(3), pp.179~189 (1978)
- 이성근, "알미늄 청동의 Annealing Hardening", 대한금속학회지, 20(5), pp.448~454 (1982)