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Title: Experimental and Numerical Investigations of Forming Behavior in Ti 6Al 4V Alloy at Elevated Temperatures
Keywords: Forming Behavior in Ti-6Al-4V, Elevated Temperatures
University: Birla Institute of Technology and Science
Completed Date: 
Abstract: In this thesis work, experimental and numerical investigations on forming behavior of Ti-6Al-4V alloy at elevated temperatures have been carried out. Accurate determination of material properties and flow stress behavior is an essential prerequisite for developing required material model in order to analyze the forming behavior of a material. The material properties and flow stress behavior have been studied from room temperature to 4000C at an interval of 500C and wide range of strain rates (10-5, 10-4, 10-3 and 10-2 s-1) using uniaxial tensile tests. Additionally, fractography study of failed tensile test specimens revealed microvoids and shallow dimples which indicated predominantly ductile failure in Ti-6Al-4V alloy at elevated temperatures. newlineFormability of Ti-6Al-4V alloy has been evaluated using deep drawing process from room temperature to 4000C at an interval of 500C. Ti-6Al-4V alloy is difficult to draw up to 1500C and within the experimental range the maximum LDR of 1.86 is obtained at 4000C. It indicates poor formability of Ti-6Al-4V at elevated temperatures. Failures in the deep drawn cups have been identified in two regions namely, initial (neck) and final (wall) failure. The fractography in neck region revealed failure due to excessive tensile stresses. However, in wall region, failure has been observed due to excessive shear stresses. The quality of successfully drawn cups has been evaluated based on thickness distribution and earing profile. The uniform thickness distribution is obtained at higher temperature with optimum blank diameter and a predominant earing tendency with four ears has been observed in all the deep drawn cups at elevated temperatures. Forming Limit Curve (FLC) has been determined experimentally for Ti-6Al-4V alloy at 4000C by conducting a Nakazima test. The various qualitative aspects ofvistretching process such as LDH diagram, thickness distribution of stretched specimens have been investigated at 4000C. newlineFor theoretical and numerical analysis, various advanced anisotropic yie
Pagination: 5.60 MB
Appears in Departments:Mechanical Engineering

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