日本金属学会誌

J. Japan Inst. Metals, Vol. 43, No. 12 (1979),
pp. 1175-1180

Anisotropic Distribution of Hydrogen Induced Lattice Strain in Fe-32.3%Ni Single Crystal

Mutsumi Touge1 and Kazuyoshi Kamachi1

1Faculty of Engineering, Yamaguchi University, Ube

Abstract:

Anisotropic distributions of hydrogen induced lattice sitran in Fe-32.3%Ni single crystal were studied with the aid of the X-ray divergent beam method.
Various phenomena such as hydrides formation, phase transformations and surface cracks were observed when hydrogen was charged cathodically into austenitic stainless steels and Fe-Ni alloys. One of the origins of these phenomena was considered to be the lattice strains induced by hydrogen charging in the steel and the alloy.
The lattice strains of the single crystal of Fe-32.3%Ni alloy were obtained by measuring lattice spacing, d, precisely of more than six independent (hkl) lattice planes using the X-ray divergent beam method. Principal strains and compositions of strain tensor were then computed by the strain analysis method in various stages of hydrogen charging. A lattice strain of an optional lattice plane (HKL) was calculated numerically using this results, and strain distribution curves on various specific sections of the specimen are drawn on polar nets for every charging time.
The strain distribution curves were anisotropic showing ellipsoidal shapes: this suggests the formation of platelet aggregations of hydrogen atoms or hydride phases. It was confirmed from an analysis of the stereographic projection that platelet aggregations were formed on 211 lattice planes along the axis of < 110 > .


(Received 1979/05/31)

Keywords:


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.