Cause analysis of surface cracking of TA1 pure titanium cold rolled sheet
Aiming at the surface cracking problem of TA1 pure titanium cold rolled sheet,the causes of cracking were analyzed by means of macroscopic analysis,scanning electron microscope(SEM),chemical a-nalysis,optical microscope and microhardness tester.The results showed that the cracking of cold rolled sheet was located in the serious surface wrinkle area,and there was a hard α phase area in the center of the wrinkle area.The hard and brittle α phases formed by the enrichment of oxygen elements could not be de-formed synchronously during the rolling process,leading to surface wrinkles with different degrees of inter-nal cracking.The area with low oxygen enrichment formed shallow surface wrinkles,while the area with high oxygen enrichment formed serious surface wrinkles.At the same time,the abnormal enrichment of im-purity Al elements in some hard α areas aggravated the embrittlement of materials,forming cleavage frac-ture.The internal cracking wrinkle defect in the sheet expanded to the macroscopic surface cracking in ad-vance.
TA1 pure titaniumcold rolled crackingsurface wrinkleoxygen enrichmenthard α phasealu-minum enrichment
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