Eddy-Current Testing of the Structure, Hardness and Abrasive Wear Resistance of Laser-Hardened and Subsequently Tempered High-Strength Cast Iron

摘要

Features of eddy-current testing to control the structure, hardness and the abrasive wear resistance of high-strength cast iron (3.6 С, 2.15 Si, 1.4 Mn, 0.07 S, 0.06 P, base – Fe, mass. %) subjected to hardening using continuous laser radiation are investigated. The distribution of hardness, retained austenite content, wear rate and indicated eddy-current values through hardened layer depth is analyzed. The changes in the reading of the eddy-current instrument depend mainly on changes in retained austenite content. The influence of tempering in the interval from 100 °C to 600 °C on characteristics of laser-hardened layer is investigated. The possibility of eddy-current testing of the abrasive wear resistance of laser-hardened high-strength cast iron in the interval from 100 °C to 600 °C is established.