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| HYDROGEN INDUCED DELAYED CRACKING OF INTERMETALLIC COMPOUND Ti-24Al-11Nb |
| Zhang Yue; Wang Yi; Wang Yanbin; Chu Wuyan; Xiao Jimei(University of Science and Technology; Beijing) |
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Abstract The behavior of hydrogen induced delayed cracking(HIDC) of intermetallic compound Ti-24Al-11Nb was investigated with single-edge notched specimens under cathodic charging. It was found that HIDC could occur for all specimens with three different kinds of heat treatment. The threshold values KIH/Kic were 0.43, 0.59 and 0.85 respectively, for specimens solution if eated (ST) at 1000 ℃ and air coooled (KIc=20MPam1/2), those ST at 1150 ℃ and furnace cooled (FC) (KIc=18.4MPam1/2) and those ST at 1000 ℃ FC (KI.=15.7MPam1/2).The experiments also showed that the HIDC of the alloy was induced by atomic hydrogen and not by hydrides. The fractograph of HIDC was dependent on the KI value. Then KI approached KIH, dimples were observed on the fracture surface; when KI became higher, the fractograph of HIDC was cleavage-like,similar to that of overloaded fracture.
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Received: 25 April 1994
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| 1StoloffNS．In:HydrogenEffectsonMaterialBehavior,EditedbyMoodyNR,ThompsonAW．TheMinerals,MetalsandMaterialsSociety,1990,p4832ZhangDZ,ChuWY,HaialJM．Scripta．Metal．Mater,1992,26:273ChuWY,ThompsonAW,WilliamsJC．ActaMetal．Mater,1992;40:4554ChuWY,ThompsonAW．MetallTrans．A,1992,23A:12995褚武扬,肖纪美,ThompsonAW．ActaMetall．Sinica,1992,5A:2866褚武扬．氢损伤与滞后断裂,北京:冶金出版社,1988,4867ChuWY,ThompsonAW．MetallTrans．A,1991,22A:718ChuWY,ThomponAW．In:HighPerformanceCompositesforthe1990's,EditedbyDasSK,BallardCP,MarikarF．TMS,143 |
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