摘要
利用感应凝壳熔炼方法,在预热的金属型中离心浇注了名义成分为Ti48Al2Cr2Nb的CA4GE型发动机用排气门。将排气门经1270℃在173MPa保温4h热等静压(HIP)处理后,其组织结构为双态组织,γ相在边界附近,尺寸较小,分布较为均匀,力学性能在815℃时σb达到470MPa,比铸态(370MPa)提高了100MPa,伸长率明显提高,达到10%以上。
Ti-48Al-2Cr-2Nb exhaust valves for CA4GE engine have been manufactured by centrifugally pouring the molten melt into preheated permanent mold in induction skull melting furnace.After HIP with 173 MPa at 1 270 ℃ for 4 hours,the microstructure is composed of double-phase structure,where γ phase with smaller size is uniformly distributed into near boundary.Tensile strength reaches 470 MPa at 815 ℃,increased by 100 MPa comparing with 370 MPa for as-cast structure,and elongation is increased by more than 10%.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2006年第4期245-247,共3页
Special Casting & Nonferrous Alloys