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对充氢的 31 0不锈钢薄膜进行TEM原位拉伸表明 ,当CH 较高时 ,氢致断裂通过纳米空洞形核 ,然后沿 {1 1 1 }面准解理扩展的方式进行 ;当CH 较低时 ,氢促进纳米空洞形核、长大和连通 ,进而导致韧断 .在此实验基础上 ,提出了一个新的模型 .该模型认为 ,位错挣脱缺陷气团的钉扎 ,并运动离开无位错区 (DFZ) ,结果沿 {1 1 1 }面产生许多空位团和氢原子簇 .氢趋于和空位团结合 ,导致纳米空洞沿 {1 1 1 }面形核 ,高密度纳米空洞来不及长大便互相连通 ,进而导致脆性扩展 ;而稀疏纳米空洞可以长大成微空洞甚至宏观空洞 ,最终导致韧性扩展 .
TEM in-situ tensile tests on hydrogen-filled 31 0 stainless steel showed that when CH is high, hydrogen-induced nucleation occurs through the nucleation of the nanopore and then propagates along the {1 1 1} surface by quasi-cleavage expansion. When CH is more When hydrogen is low, hydrogen promotes the nucleation, growth and connectivity of the nanovoids, which in turn leads to ductile fracture.On the basis of this experiment, a new model is proposed, in which the dislocation breaks away from pinning the defect air mass and moves away from no position (DFZ), resulting in many vacant clusters and clusters of hydrogen atoms along the {1 1 1} plane. Hydrogen tends to combine with vacancy groups, resulting in the nucleation of nano-voids along the {1 1 1} plane and the lack of high-density nano-voids Stool interconnected, leading to brittle expansion; and sparse nano-hole can grow into micro-cavities or even macro-hollow, eventually leading to the expansion of toughness.