Effect of ageing on the drawability characteristics of Nimonic C - 263 alloy sheet by numerical simulation

摘要

The drawability characteristics, in terms of Limit Drawing Ratio and Limit Strains of Nimonic C - 263 alloy sheet in solution treated (ST) and in peak aged (ST+1073K/8h aged) conditions are investigated, compared and presented using an explicit finite element code LSDYNA 3D. The material properties and the material model are evaluated by the conduct of tensile tests. Also reported in brief are the details of microstructure, texture and tensile fracture behaviour as a function of ageing and sheet thickness. The limit drawing ratio for the alloy was found to be significantly lower in both the heat treatment conditions - 1.34 in ST and 1.23 in peak aged conditions. The study reveals that the safer forming limits in strain space are higher for ST alloy and in stress space is higher for ST + aged alloy.