Erosion–Wear Behaviors of High-Chromium Cast Iron with High Nitrogen Content in Water–Sand Slurry and Acid–Sand Slurry

Abstract

High-chromium cast iron with high nitrogen content (HNHCCI) was prepared using a vacuum induction barotropic furnace, and the erosion–wear behaviors of HNHCCI were investigated with a rotary erosion–wear tester. Results show that most of the nitrogen in HNHCCI dissolves into the matrix and some nitrogen forms carbonitride in the solidification process. The relative wear resistance of HNHCCI can reach 1.34 times that of high-chromium cast iron. The erosion–wear morphologies are ploughing, indentation, and large chips in water–sand slurry, whereas it is galvanic corrosion and carbide fracture in acid–sand slurry. HNHCCI has better mechanical properties and corrosion resistance than HCCI, decreasing the synergism of corrosion and wear. Therefore, HNHCCI has a lower erosion–wear rate.