本文研究了30CrMnSiA高强钢在纯Ⅰ型、纯Ⅱ型和(Ⅰ+Ⅱ)复合型加载条件下的氢致开裂。实验表明,在1NH_2SO_4溶液中预充氢的试件在上述加载条件下均表现出氢致脆性。纯Ⅱ型氢致开裂门槛值K_(ⅡH)/K_(ⅡX)=0.27,与纯Ⅰ型门槛值K_(ⅠH)/K_(ⅠX)=0.29基本相同,而在K_Ⅱ/K_Ⅰ比值为0.27,0.4和0.81时,(Ⅰ+Ⅱ)复合型氢致开裂门槛值分别为0.36,0.41和0.37,表明纯Ⅰ型和纯Ⅱ型具有更高的氢脆敏感性。最后用自Ⅰ型加载向Ⅱ型过渡时,三轴张力和塑性变形程度这二个矛盾因素对氢致开裂的共同作用解释了上述实验结果。
Hydrogen induced cracking of 0.3% C,1% Cr, 1% Mn, 1% Si highstrength steel has been studied under simple mode Ⅰ, mode Ⅱ and (Ⅰ+Ⅱ) mixedmode loading conditions. After being hydrogen-charged in 1N H_2SO_4 solution, thematerial behaved hydrogen embrittlement in all the cases studied. The results showthat simple mode Ⅰ or mode Ⅱ loading are more susceptible to hydrogen embrittle-ment than (Ⅰ+Ⅱ) mixed mode. For explaining the experimental results, the effectsof hydrostatic tension as well as plastic deformation ahead of crack tip has beendiscussed.
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