不均一組織をもつ鉄鋼材料の微小部 X 線回折による評価(微小域構造解析)(<特集>分析評価・解析)

概要

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The accuracy in the determination of lattice parameters of diffraction patterns by means of microbeam X-ray diffraction method has been studied with a curved position sensitive proportional counter for the cross-sectional measurements of partially crystallized Fe-B-Si amorphous ribbons and sintered Ni-Cu-Mo alloyed steels after case-hardening. It was found that the accuracy of lattice parameters was 0.2% when the parallel X-ray beam with 50 μm width was used. The sizes of X-ray spots at the specimen surface were two or three times as large as those of the collimeters. The crystalline phases formed in a thick amorphous ribbon by rapid quenching of Fe_<78.5>B_<13>Si_<8.5> alloy liquid were α-Fe (Si) and Fe_2B. The critical thickness of glass formation in the present quenching condition was about 40 μm. Standard diviation of the dimensional change in the sintered compacts of Ni-Cu-Mo alloyed steel powders became smaller when Ni content increased, because microstrain in the martensitic structure became smaller with Ni content after case-hardening.
社団法人日本鉄鋼協会の論文
1991-11-01