結晶学的破面解析によるチタニウム薄板材の疲労き裂伝ぱ機構の検討

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Abstract　To clarify the micromechanisms of fatigue crack propagation in titanium, fracture surface of thin plate specimens fatigued under plane bending have been crystallographically studied. Large grain specimens with average grain size of 10mm in diameter were used and their thickness was 0.3mm. Then, the grains ran completely across the specimen thickness. Crystallographic analysis technique of fatigue fracture surface has been developed through connecting stereographic projection based on the X-ray microbeam Laue photographs of crystal surface with stereomicrophotogrammetry of fracture surface by SEM. The technique permits us to examine crystallographically the fracture surfaces of the thin plate less than 0.5mm thick and of the grains occupying surface layer in polycrystalline aggregates, for which crystallographic studies have been quite limited because of their technical difficulties. It was found that when grains had orientation favourable to slip deformation, fractographic features were progressively transfomed from ductile mode, characteristic of the regions closer to specimen surface, into brittle one with increasing crack depth. Twin planes in addition to normal slip planes appear to play an important role in forming striation, when they have favourably oriented to cause deformation cooperative at the tip of advancing crack. The (0001) cleavage observed were discussed in association with contents of oxygen interstitial solute atoms resulting from long time annealing for producing large grain specimens and the orientation factor cos2φ, where φ was the angle between the specimen axis and (OOO1) plane normal.
山形大学の論文
1986-01-20

結晶学的破面解析によるチタニウム薄板材の疲労き裂伝ぱ機構の検討

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