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利用特殊的四边形夹具可分别施加等值的拉、压载荷,同时测出拉、压应力引起的相对稳态氢渗透通量的变化就可求出氢的应变场。结果表明,氢在铁中的应变场是非球对称的,且;ε_1>0,ε_2=ε_3<0。 实验表明,氢的表观偏克原子应变场和表观偏克原子体积均随体内氢浓度的增加而下降。用最小二乘法可获得氢浓度趋于零时的真实值,分别为ε_1=0.37,ε_2=ε_3=-0.11,V_H=2.49cm~3/mol。实验还表明,外加应力大小对应变场没有影响。
Using a special quadrilateral jig can be applied to the equivalent tensile and compressive load, measured simultaneously pull and compressive stress caused by relatively steady-state hydrogen permeation flux changes can be obtained hydrogen strain field. The results show that the strain field of hydrogen in iron is aspheric symmetric, and; ε_1> 0, ε_2 = ε_3 <0. Experimental results show that both the apparent strain field and apparent P-atom strain of hydrogen decrease with the increase of hydrogen concentration in the body. The least square method was used to obtain the true values of hydrogen concentration approaching zero, which were ε_1 = 0.37, ε_2 = ε_3 = -0.11 and V_H = 2.49cm ~ 3 / mol, respectively. Experiments also show that the applied stress has no effect on the strain field.