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Catia V5R20 Full Version With Crack - Softwares 4 U

A comparative study on the cracking behaviour of carbon steel samples under high cycles of stress-relief twinning was conducted in this work. The samples were investigated by means of Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Energy Dispersive Spectroscopy (EDS), Electron Backscatter Diffraction (EBSD) and X-ray Diffraction (XRD) before and after the fatigue test. The results reveal that the crack formations were mainly due to both martensitic transformation and precipitation of martensite during the stress-relief twinning cycles. At the third stage, with the dissolution of the martensite, cracking appeared and then the crack grew during the fourth stage. The damage identified in this work is the first observation of crack propagation due to precipitation of martensite.

Crack Catia V5r20 11

This paper reports on the mechanical and microstructural characterization of MA7Mo3 Cu6Al steel exposed to nitrogen attack, aiming to investigate the mechanism for hydrogen embrittlement and the development of its N3 steel equivalent formulation. The steel is based on commercial austenitic stainless steel, developed as a nuclear component material. Several tensile tests with increasing temperature were carried out in order to investigate both the embrittlement mechanism and the selection of the N3 steel equivalent formulation. Surface and fractography analyses were also carried out. The results show that nitrogen attack can generate cracks, especially at the grain boundaries. It was observed that the mechanical properties increased when the temperature increased, but the steel remained in ductile behaviour at the strain rate investigated. The N3 steel equivalent formulation was characterized by TEM microstructure and EDS results. A coating layer on the exposed sample surfaces was observed, not related to hydrogen, and may be formed by Al attack due to the presence of aluminum in the steel itself.


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