《Fatigue+small+crack+behavior+of+Ti-6Al-4V+alloy》.pdf

20 3 Vol.20, No. 3 2000 9 JO RNAL OF AERONA T ICAL MATERLALS September 2000 T-i 6A-l 4V 胡本润 吴学仁 丁传富 ( , 100095) : T-i 6Al-4V K , R= 0 R = - 1,R= - 1 ,R= - 1 , R= 0 , : ; T-i 6Al-4V ; : TG146.2;TG115.5 : A : 1005-5053( 2000)03-0033-05 [1,2] : K ; K th,, , , , [3] , T-i 6A-l 4V , , 1 试验方法 1. 1 T-i 6Al-4V ,( 1) , , A B 1A B , 2 A B : 2000-06-04; : 2000-07-07 : ( 1972-) , , 34 20 ,, A B 3 1.2 , ( CCT) , (SENT) (R= 0, max= 300MPa; R= - 1, max= 200MPa) 1 Table 1 Two kinds of heat treatment Microstructure Heat treatment A 1060 1h, F. C. B 1060 1h, A.C., 900 1h, F.C. 2 A B T able 2 Large prior-grain size and width of lamellar Microstructure Width of lamellar/m Large prior-grain size /m A 6. 35 668. 42 B 2. 11 433. 13 1 T-i 6A-l 4V (a) A ; ( b) B Fig. 1 Microstructures of Ti-6A-l 4V alloy (a) microstructure A;( b) microstructure B 3 T-i 6A-l 4V 35 2 试验结果与讨论 2. 1 R= 0 , 60%~ 70%,R= - 1 ,20%~ 30% K da/ dN , 2,3 ,