Liufa LIU
,
Chen LU
,
Wenjiang DING
,
Akio Hirose
,
Kojiro F.Kobayashi
材料科学技术(英文)
The effect of δ phase on the hydrogen embrittlement (HE) sensitivity of Inconel 718 was investigated by conducting notch tensile tests. Notch tensile specimens with various precipitation morphologies of δ phase were prepared with different heat treatments, and hydrogen was charged into the tensile specimens before tensile tests via a cathodic charging process. The loss of notch tensile strength (NTS) due to the charged hydrogen was used to evaluate the hydrogen embrittlement sensitivity. The results show that δ phase has deleterious effect on NTSs, and the fracture of hydrogen-charged specimens initiated near the notch surfaces. The loss of NTS caused by precharged hydrogen can be greatly decreased by dissolving δ phase. δ-free Inconel 718 alloy is proposed for the applications in hydrogen environments.
关键词:
Superalloy
,
null
,
null
,
null
万冰华
,
杨军
,
王福新
,
修文波
,
高文
电镀与精饰
doi:10.3969/j.issn.1001-3849.2014.03.006
叙述了无氰镀镉镀液的配方及工艺参数,总结了镀液的配制以及维护经验,分析了镀液的分散能力、深镀能力和沉积速率以及镀层的耐蚀性和氢脆等性能.结果表明,无氰镀镉紧固件电镀产品与传统氰化镀镉电镀产品性能相当,可以取代传统的氰化镀镉工艺.
关键词:
紧固件
,
无氰镀镉
,
分散能力
,
深镀能力
,
氢脆
韩露
,
刘春立
,
王影
,
谢国君
,
卢克非
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2014.06.015
分离装置静力试验后发现连接两个舱体的双头螺栓中有7件发生断裂,螺栓表面进行了达克罗处理.通过失效分析及相关试验综合分析认为,分离装置上7件螺栓的断裂性质均为延迟性脆性断裂,断裂机理为氢脆.导致发生氢脆断裂的原因除螺栓材料及组织具有较高的氢脆敏感性外,主要与静力试验过程中长时间包覆湿泥有关;另外,原材料氢含量控制及达克罗涂层工艺处理虽然有效避免了产品表面处理过程中带来的氢脆隐患,但是若使用环境中存在水及腐蚀性介质Cl、S时,产品在拉应力作用下仍可能发生氢脆延迟断裂而导致严重后果.
关键词:
30CrMnSiNi2A
,
双头螺栓
,
达克罗
,
氢脆
,
电化学腐蚀
王燕斌
,
王安荣
,
褚武扬
,
肖纪美
金属学报
采用Lange式透射X射线形貌照相法研究了电解充氢导致Fe-3wt-%Si单晶中氢损伤的规律。结果表明:在不加毒化剂的1mol/LH_2SO_4中电解充氢时,不产生氢损伤;在有毒化剂时,即使电流密度很低,也会产生氢损伤。在一定电流密度下产生的氢损伤有一极限大小,并不随充氢时间增加而无限止长大。随电流密度增加,氢损伤尺寸增大,但当电流密度较大时,这种增大不明显。外应力显著促进氢损伤。在含毒化剂时,氢渗透曲线随时间延长而下降是由于产生了氢损伤所致。
关键词:
氢损伤
,
X-ray topography
,
Fe-3 wt-%Si alloy