磁場對氫擴散及氫脆化之效應（Ⅰ）（Ⅱ）

Effects of Magnetic Field on Hydrogen Diffusion and Hydrogen Embrittlement in Metals

本研究利用ASTM A387合金鋼，在充氫及未充氫狀況下，施予不同強度之磁場（最大0.16 Tesla），量測其機械性質之變化。研究發現充氫試片的上降伏點（UYP）及上下降伏強度差（Δσ）受磁場影響而下降，且磁場愈大，Δσ變異則變小，未充氫的試片其UYP與Δσ較不受磁場影響。磁場對鐵磁性合金機械性質的影響，可用磁場與差排之相互作用的理論解釋之。

The low alloy steel ASTM A387 was used for the test. Specimens, cathodically charged or uncharged, were tensile tested in the presence of a magnetic field at a range of 0-0.16 tesla. The mechanical properties were measured. It was found that the U YP (upper yield point) and Δσ(yield drop) for charged specimens were substantially reduced in the magnetic field, whereas the variations of U YP and Δσ were relatively small for uncharged specimens. The scatter of Δσ for charged specimens decreased as the magnetic field increased.