Date

2015

Document Type

Thesis

Degree

Master of Science

Department

Materials Science and Engineering

First Adviser

Misiolek, Wojtek

Abstract

The purpose of this work was to conduct a reverse engineering evaluation to attain state variables such as flow stress, strain, and strain rate for a finite element (FE) simulation of the rolling process. The alloy investigated included as cast and wrought Nickel Aluminum Bronze (NAB) of the similar chemistry. Chemical analyses of the materials were in conformance with the ASTM B150 and ASTM B 171 C6200 specifications. Tensile testing results of the wrought material did not show a significant difference between the transverse and longitudinal directions. Microstructural examination of the wrought material in the transverse, and in the longitudinal directions revealed minimal difference in the grain size and shape. This observation is consistent with the cross-rolling work reportedly done on the commercial plates. It was observed a typical NAB alpha (α) phase with kappa (κII), (κIII), and (κIV) phases. The (κI) phase was not observed possibly due to low iron content. The grain size of the wrought and the as-cast material was determined using the ASTM E112 comparison method. The as cast (NAB) was poured into ingots and exposed to various heat treating conditions for microstructure evaluation. The metallography results of the ingots revealed that the original material prior to being cold rolled had an as cast microstructure. The study was completed performing deformation testing on a Gleeble 3500 system in the plain strain hydra-wedge to obtain flow stress curves at strain rate s-1 0.1,0.3,1, 5 and 20. It was learned the as cast material can only be deformed up to 15.9 % reduction.

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