王艳飞
,
巩建鸣
,
唐建群
,
蒋旺
,
姜莹洁
中国腐蚀与防护学报
利用有限元法对高强度珠光体钢丝冷拔残余应力应变进行有限元分析，在此基础上利用有限差分法计算应力应变同时诱导下的氢扩散浓度分布规律，并比较其与只考虑残余应力诱导氢扩散模型所得氢浓度分布规律的不同。结果表明，由于冷拔加工过程中钢丝表面和内部变形速率的差异，冷拔后在钢丝表面产生较大的残余拉应力和大量的塑性应变。残余应力应变的存在，加剧氢在材料中的扩散和聚集，其中应变的影响相当明显。在短时间内，由于塑性应变降低氢在材料内的扩散系数，所以同时考虑残余应力和应变引起的氢富集水平低于只考虑应力诱导引起的氢富集水平。随着时间的增加，应力应变引起的氢富集浓度明显大于只考虑应力诱导时的氢富集浓度。塑性应变会引起氢富集已经被大量实验所证实，同时考虑应力应变对氢扩散的影响更具有实际意义，为进一步建立准确的钢丝氢脆模型提供参考。
关键词:
冷拔
,
residual stress
,
strain
,
hydrogen diffusion
,
steel wires
YANG Ke
,
CAO Mingzhou
,
WAN Xiaojing
,
SHI Changxu Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
China.
材料科学技术（英）
The model of hydrogen diffusion formerly de- veloped [1] has been applied successfully to the hydrogen permeation experiment results of three kinds of materials,α—Fe,Fe—Ti alloy and Fe—Ti—C alloy by the mathematical fitting method.From the fitting results it was shown that the model can re- fiect well the diffusion of hydrogen in the materials with trapping.The obtained trapping parameters(α and β)can be used to explain well the diffusion of hydrogen in the samples with trapping.
关键词:
hydrogen diffusion
,
null
,
null
,
null
XU Jian SUN Xiukui CHEN Wenxiu LI Yiyi State Key Laboratory of RSA
,
Institute of Metal Research
,
Academia Sinica
,
China research assistant
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
Permeability and diffusivity of hydrogen in Fe-Ni-Co based superalloy lncoloy 903 were measured over the temperature range of 220 to 420℃ using a gaseous permeation technique. The effect of strengthening phase γ' precipitated after being aged on the hydrogen permeation and diffusion was investigated.It was indicated that the permeability and diffusivity of hydrogen in the alloy hardly depend on heat treatment condition and are not af- fected by γ' phase precipitated after being aged.The relationships between the permeability and diffusivity of hydrogen and the temperature can be respectively expressed as Φ=9.36×10~(-5)exp[-54.20(kJ/mol)/RT]mol/m·s·MPa~(1/2)and D=4.24×10~(-7)exp[-49.07(kJ/mol)/RT]m~2/s.
关键词:
hydrogen permeation
,
null
,
null
,
null
,
null
武光宗
,
王毛球
,
甘国友
,
董瀚
钢铁研究学报
采用TDS方法研究了氢在两种马氏体钢中的扩散行为,结果发现氢在高铬低铝的D2钢中的扩散显著低于低铬无铝的D1钢。从充氢试样室温放置时氢体积分数下降规律可知,氢在D1钢和D2钢中的扩散系数分别为1.52×10-7和5.3×10-8cm2/s。D2钢中存在大量细小的碳化物,既对氢的扩散起到阻碍作用,降低氢的扩散系数,又可作为氢陷阱,使氢含量增加。D2钢的氢脆敏感性低于D1钢。
关键词:
马氏体钢
,
氢脆
,
氢扩散
,
TDS
武光宗
,
王毛球
,
王春芳
,
甘国友
,
董瀚
材料热处理学报
通过TDS方法研究了氢在18Cr2Ni4W和25CrNi2MoVNb两种低温回火马氏体钢中的扩散行为，同时结合慢应变速率拉伸实验研究了这两种马氏体钢的氢脆敏感性。结果表明，与18Cr2Ni4W钢相比，25CrNi2MoVNb钢因碳含量较高和晶粒显著细化作用使抗拉强度从1300MPa级提高到了1500MPa级后，其氢脆敏感性也明显增加。通过试样充氢后放置试验，测定氢在25CrNi2MOVNb钢和18Cr2Ni4WA钢中的扩散系数分别为7．87×10-7cm2／s和3．99×1011-7cm2／s。可见，氢在25CrNi2MoVNb钢中更容易扩散，因而在充入相同可扩散氢时，25CrNi2MoVNb钢性能损失更大。
关键词:
马氏体钢
,
氢脆
,
氢扩散
,
TDS
