Hexagonal Bar Splitting Experiment

Hexagonal Bar Splitting experimentHEXAGONAL BAR SPLITTINGInformation AvailableFailure of the discontinue was experienced during cold forming operation.The bulwark was produced by hot forming.The shape was hexagonal, the sign bar size was ab fall out 20mm.The material used in the reaping was mild steel.Fig (1) Fracture mode, rupture section in the barThe composition of mild steelAccording to the chemical analysis reputation that was done by atomic emission spectrometry (AES) the sample contains the sideline elementsElementWt %FebalC0.143Mn0.73S0.043Si0.345P0.035Nb0.015metallurgist analysis indicated to presence of 0.04% S which is considered high case of Sulphur to use in steel. Sulphur lowers ductility and nonched furbish up toughness and has little effects on the longitudinal mechanical properties.The parameters of forming subprogram the compressive forces applied by the rolls to reduce the thickness of the material or changes its crossbreed sectional area, the contour o f the roll gap and roll configurations.The requested tests more(prenominal) specific and precise information should be available to determine the raw material cause of the failure. The following techniques could be usefulX-Ray Diffraction (XRD) to get plenteous data about the chemical composition of the bar material and the crystallography structure. As well, Scanning Electron Microscope (SEM).Ultrasonic testing to estimate the size, orientation, shape and character of defects.Manufacturing border Hot RollingCoolingIn all roll processes, cooling the steel is a critical factor. The speed at which the involute product is cooled will affect the mechanical properties of the steel. Cooling speed is controlled commonly by spraying water on the steel as it passes by dint of and/or leaves the mill, although occasionally the rolled steel is air-cooled using braggart(a) fans.(internal defect in steel during manufacturing) Centreline segregation occurs within continuously retch slab a nd this influences the type of the localised microstructure. Elements which are prone to segregate in structural steels include C, Mn, Si, P, S and Nb and an accurate measure of the segregation fervency can be obtained using electron probe microanalysis. It is known that such segregation can influence the fracture toughness together with opposite properties. There is growing concern among customers and regulating bodies that present specifications do not take sufficient account of this fact. It is, on that pointfore, important that a quantitative affinity be established between the intensity of the segregating elements and the fracture toughness so that compositional adjustments to the parent habitation can be made in order to optimise properties. Since it is not possible to obtain commercial samples of plate having controlled segregation characteristics it is intended to replace the central segregated region in commercial slab with inserts of known composition and thickness. It is also intended to carry out a limited assessment of the weldability of the segregated samples including the influence on the HAZ toughness. (1)CrocodilingThe fortune telling of defect during rolling process is so complex because that is related to tenfold parameters including cool rating, composition, distribution of carbides, deformation, etc.In this case study there is a rolling defect which in known as split end or crocodiling. This phenomenon initiates as a crack forming along the nitty-gritty plane of the deformed bar.The cracks in this situation are formed by cleavage fracture at the centerline of the bar, resulted from the stresses during drawing. In the drawing process the hydroststic stress components are basically tensile stresses. The fracture mechanism of elasticity was primarily cleavage in the direction perpendicular to the rod plane. (2)The major variables that affect mechanical properties and formability are working temperature, temperature of annealsbetwe en operations, percentage of decrease after the final anneal, and temperature of final heat treatment.1. Effect of centreline segregation on the toughness of structural steels2. Wla R. A. Toughness of Ferritic Stainless steels. 1980.