Y.Kurata and H.Utsumi (Japan Atomic Energy Research Institute
,
Tokai-mura
,
Naka-gun
,
Ibaraki-ken
,
319-1195
,
Japan)(Tohoku University
,
Sendai
,
980-8579
,
Japan)
金属学报(英文版)
Applicability of the following creep constitutive equations was investigated for normal type creep curves of Ni-18.5Cr alloy and tertiary creep dominant curves of Ni-18.5Cr16W alloy under constant load: the θ projection method describing a creep curse by a sum of two exponential terms, modified θ method describing a primary creep stage by an exponential term and a tertiary creep stage by a logarithmic term, modified Ω method describing a creep curve by a sum of two logarithmic term, 2θ method with only a tertiary creep component and Ω method. The θ, modified θ and modified Ω methods can describe normal type and tertiary creep dominant curves. Tertiary creep dominant curves of Ni-18.5Cr-16W alloy at 900℃ are also described using 2θ and Ω methods. Applicability of the modified θ and modified Ω methods is superior for constant load creep curves because they can predict creep curves up to rupture and rupture life accurately and conservatively.
关键词:
creep equation
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null
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null
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null
,
null
梁峰
,
王佳
,
曹楚雨
,
林海潮
腐蚀学报（英文）
结合极化曲线的测量,考察了铁在除氧的不同pH值1N溴化钾溶液中的阳极溶解过程交流阻抗频谱特征,在所考察的pH值范图内,铁阳极溶解过程的塔菲尔斜率约为70mV/dec.。在较低极化电位下,pH值为4.0,2.0,1.3,0.6时,阻抗谱由一个低频感抗弧及一高频容抗弧组成;在较高极化电位下,且pH值为1.3,0.6时,阻抗谱仍为一个低频感抗弧及一高频容抗弧,pH值为2.0,4.0时,随极化电位升高,此时阻抗谱是由一个高频容抗及一低频容抗弧组成。分析了形成各种阻抗谱的原因。实验结果支持了Ken Nobe所提出的
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