In order to investigate the hydrogen gas effect on the fatigue limits of austenitic stainless steels, SUS304 and SUS316L, with small twin blind holes, metal fatigue tests were carried out in low pressure hydrogen gas, in air and in inert gases; i.e., argon or nitrogen. The fatigue limit of SUS304 is defined as the crack propagation limit not only in air, but also in hydrogen and nitrogen. The fatigue limit of SUS304 in hydrogen gas is slightly higher than that in air. The extremely low Fatigue Crack Growth Rates (FCGR) of not only SUS304, but also SUS316L in hydrogen gas is lower than that in argon gas in the FCGR region of less than 10-9 m/cycle. This seems to be due to the plasticity-induced crack closure, and supports the higher fatigue limit in hydrogen.
In Qrder lo invcst { gate the 1 ユydrogen gas efrect 〔 m the fatTgue limits of austen [ tic st 自inless stee ] SUS3 〔 , 4 and SUS316Lwith small twin b 「 ind ho ' es , meLal fat 雪 gue 吐 ests are carried Qut iTl a low pressure hydrog 巳 n gas, in f ir and inert gases ; argor 〕 oT niLrogen , The fatigue limit〔♪ f S疋IS304 is de百ned as the crackpropagation hinit not し )】 コlyin airbut a ] so lr 】hydrogeII and in nitr ' : } gen , And the faし igue limit of SUS3 〔 14 ill hydrogen gas is slightlyhigher tha ロ in air . The extrelllely low Fatiguo 〔 二 rack Gr 〔 } wth Rates ( FCGR )ofn ( 几 only SUS304 and but also SI . FS? ,⊥ 6L inhyclrogen ffas is lower 亡 han し ha しin ar 墓 Qn gas in the region of FCGRIower thaniO − e m 、 ! cycle . This see 】lr1 t. O be duc し〔 ) plasticil . y − illduced crack closure and sl1PP ( ,rts hjgher far . igue lirnit itl hydrugen 、 A
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