Effect of Stress and Temperature on Hall Coefficient in Two Nickel-base Superalloys

This paper investigates the effect of stress and temperature on the Hall coefficient in two Nickel-base superalloys, Inconel 100 (IN100) and Rolls-Royce 1000 (RR1000). The promising result indicates the feasibility of exploiting this technology for residual stress measurement in surface-enhanced aircraft engine components. A highly precise measurement system has been established based on the modified alternating current potential drop (ACPD) method. It is capable of measuring the Hall coefficient nondestructively on 1 mm thick specimens with a measurement standard deviation of 0.03%. It is worth noting that the Hall coefficient is negative and decreases linearly with elastic tensile stress in both tested materials. The linear relationship between the Hall coefficient and temperature has also been established to compensate the temperature effect in future measurements.