Hydrogen Embrittlement of Steels under Constant Load Rupture Test (Report 3)

The Effect of U-and V-notches on the Hydrogen Embrittlement of Steels

Abstract

In the previous paper, authors reported on the hydrogen embrittlement of several kinds of commercial steels in the constant load rupture test.
In this paper, authors report on the effect of U- and V-notches on the hydrogen embrittlement of steels; mild steel, HT-60 steel, HT-80 steel and the weld joint of HT-60 steel, in the C.L.R. test. Hydrogen was charged into steel specimen cathodically under given constant load.
The results obtained are summarized as follows;
(1) The sensitivity of hydrogen embrittlement of steels is affected by the shape of notches, and steels having a severe notch are subject to more remarkable embrittlement than ones having a relatively dull notch.
(2) The fracture of the specimens with the notched part insulated occurs after longer loading period than the case of notched specimens directly charged, under the same stress.
(3) From the results on the weld joint specimens, it was known that hydrogen exerts a serious influence upon the weld part and bonding part.