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베타 티타늄합금의 Sub-Zero 냉각에서 상변화 현상
김성준,김승언,최병학,최기성,이백희,서성교,이룡태 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.4
A study on the phase transformation of martensite in metastable beta phases induced by sub-zero quenching after solid solution treatment has been done. TEM examination was carried out to characterize the structure of martensite and metastable phase in a commercial titanium alloy, β-C. The results showed that the martensite had a twinned hcp structure. It is believed that this structure is generated initially by a martensitic transformation from the metastable bcc phase which is consisted of tweed structure in matrix.
최재호,김성준,이용태,최병학,이백희,김승언 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.10
The microstructure of commercially used metastable β-Ti alloy was investigated at the as-quenched state of β-C (Ti-3Al-8V-6Cr-4Mo-4Zr) using a transmission electron microscopy. The microstructure of metastable β phase, so called $quot;tweed structure$quot;, shows fine streak lamella. The microstructure may have significant effect on mechanical properties of hardness, strength and toughness, because structure of the phase provides many heterogeneous nucleation sites during the aging. The commercially used β-Ti alloys do not undergo a martensitic transformation at the state of solution treatment and quenching because of the excess addition of β forming elements such as V, Cr and etc. However, β-C alloy shows the martensite phase transformation in the cases of subzero quenching after solution treatment and tensile test at room temperature after as-quenched state.