TABLE OF CONTENTS JIMING CHEN [1] , YING XU [1] , SHAOYU QIU [2] , T. MUROGA [3] , YING DENG [1] , ZENGYU XU [1]
A V4Cr4Ti alloy (NIFS-Heat 2) has been studied on its hydrogen embrittlement behavior using tension test, impact test and J integral test. Hydrogen in the alloy got high up to 310wppm by an exposure in a hydrogen atmosphere. The alloy showed different sensitivities to the hydrogen embrittlement in the tests. Hydrogen induced hardening occurred which caused the slight loss in the ductility of the alloy before 215wppm hydrogen concentration in the tension test. However, the impact toughness, J 1c decreased largely with the increasing hydrogen concentration, suggested that tension test is not a suitable method to be used to evaluate the hydrogen embrittlement of the alloy.
Key words: Vanadium alloy, hydrogen embrittlement, J 1c, impact energy
[1] Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, P.R. China
E-mail: chenjm@swip.ac.cn
[2] National Key Lab of Nuclear Fuel and Materials, P.O.Box 436, Chengdu 610041, P.R.China
[3] National Institute of Fusion Science, Oroshi, Toki, Gifu 509-5292, Japan
Hydrogen embrittlement is one of the key issues for vanadium alloys in their fusion applications. Many researches use tensile test to study the embrittlement behavior [1 ,2 ]. One reported that the V4Cr4Ti alloy (heat 832665 produced in U.S.) could bear at least 400wppm hydrogen without significant loss in the tensile elongation[3]. Thus it seems that hydrogen embrittlement is not a serious concerns for...
