α+ TYPE TITANIUM ALLOY AND METHOD FOR PRODUCING THE ALLOY

• Main Authors: KANANO OSAMU, FUKADA NOBUO, HAYAKAWA MASASHI
• Format: Patent
• Language: English; Japanese
• Published: 04.06.2015
• Subjects: ALLOYS; CASTING; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

PROBLEM TO BE SOLVED: To provide a method for producing a titanium alloy member having strength higher than that of the conventional one, particularly, combining elongation and tensile strength, and also having high yield, and a titanium alloy member obtained by the production method.SOLUTION: Provided is an α+ type titanium alloy characterized in that the abundance ratio of a phase to an α phase in a titanium alloy lies in the range of 50 to 70%, the average crystal grain size of the α phase being 5 to 15 μm, and the average crystal grain size of the phase being 15 to 30 μm. Also provided is a method for producing an α+ is characterized in that an alloy composition powder is uniformly mixed to titanium powder or titanium alloy powder at a ratio of composing the titanium alloy or the like, thereafter, densifying treatment is performed, next plastic working is applied, and further heat treatment is performed thereto. 【課題】従来に比べて高い強度を有し、特に、伸びと引っ張り強度を兼備し、かつ歩留まりの高いチタン合金部材の製造方法および同製造方法で得られたチタン合金部材を提供する。【解決手段】チタン合金中のα相に対する 相の存在比が５０％〜７０％の範囲にあって、α相の平均結晶粒径が５μｍ〜１５μｍであり、 相の平均結晶粒径が１５μｍ〜３０μｍであることを特徴とするα＋ 型チタン合金。また、このチタン合金の製造方法であって、チタン合金を構成するような比率でチタン粉またはチタン合金粉に対して合金組成粉を均一混合した後、緻密化処理して、次いで塑性加工を付与してから、更に、熱処理することを特徴とするα＋ 型チタン合金の製造方法。【選択図】なし