Dynamics detection between hydrogen and dislocations in materials and hydrogen degradation mechanism using advanced analysis

利用四极质谱仪和拉伸试验机研究了体心立方(BCC)晶格的纯铁和面心立方(FCC)晶格的Inconel625合金在拉伸变形过程中的放氢行为。在弹性形变条件下，氢的脱附没有增加。而纯铁和Inconel625合金则在塑性变形开始时，在保证应力下迅速增加，并达到最大值，然后逐渐降低。这种脱附行为与位错运动对氢的拖拽有很大关系。位错和氢之间的这种相互作用导致金属中的晶格缺陷增加，从而降低延伸率。

Hydrogen desorption behaviors of pure iron with a body-centered-cubic (BCC) lattice and Inconel 625 with a face-centered-cubic (FCC) lattice were examined during tensile deformation using a quadrupole mass spectrometer in a vacuum chamber integrated with a tensile testing machine. Hydrogen desorption did not increase under elastic deformation. In contrast, it increased rapidly at the proof stress when plastic deformation began, and reached its maximum, then decreased gradually for both pure iron and Inconel 625. This desorption behavior is considerable related to hydrogen dragging by dislocation mobility. This interaction between dislocations and hydrogen causes to enhance lattice defects in metals, and then reduce elongation.