Diffusivity, solubility and trapping behavior of hydrogen in alloys 600, 690tt and 800
Diffusivity, solubility and trapping behavior of hydrogen in alloys 600, 690tt and 800
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DOI：
10.1016/s0010-938x(97)00167-4
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发表时间：
1998-04
影响因子：
8.3
通讯作者：
M. Uhlemann;B. G. Pound
中科院分区：
文献类型：
--
作者：
M. Uhlemann;B. G. Pound
采用渗透技术和恒电位脉冲技术研究了氢(H)在600、690tt和800三种奥氏体合金中的扩散率、溶解度和俘获行为。表观扩散系数随镍含量的增加而增加，而溶解度随镍含量的增加而降低。扩散系数随冷做功而减小。在50%冷加工的合金中，H可逆地困在位错应力场中。不可逆俘获速率常数与观察到的非冷加工合金对环境辅助开裂的抵抗力相似。主要的不可逆圈闭是碳化物/碳氮化物沉淀。微孔在预充冷加工合金600中提供了额外的不可逆陷阱。
The permeation technique and a potentiostatic pulse technique were used to investigate the diffusivity, solubility, and trapping behavior of hydrogen (H) in three austenitic alloys: 600, 690tt and 800. The apparent diffusivity increases with nickel content, whereas the solubility decreases. The diffusivity decreases with cold work. In the alloys with 50% cold work, H is reversibly trapped in the stress field of dislocations. The rate constants for irreversible trapping paralleled the observed resistance to environmentally assisted cracking of the non-cold-worked alloys. The principal irreversible traps appeared to be carbide/carbonitride precipitates. Microvoids provided additional irreversible traps in precharged, cold-worked alloy 600.