Effect of External Integrated Treatment on the Structure and Properties of the Castings from Steel Grade 35L

Abstract

The methods of influence of external physical and thermophysical factors on the cast steel structure formation are considered in the paper. High-temperature processing of the melt is an effective method of heat treatment. It improves a wide range of mechanical and operational properties of finished castings. The parameters of high-temperature treatment were established experimentallyin the course of this study. Its influence on the structure and properties of 35L steel castings has been shown. The usage of a nanosecond electromagnetic pulse during the crystallization of a casting in the mold is a method of dynamic action on the metal liquid phase. The parameters of nanosecond electromagnetic pulse processing during crystallization were determined by the technical capabilities of the electromagnetic pulse generator.The study of the properties and structure of samples cast from a melt processed by electromagnetic pulses confirms the improvement of the mechanical and operational properties of castings by improving the primary cast metal structure. The influence of metal overheating, nanosecond electromagnetic pulse, and temperature-time holding on the structure and mechanical properties of castings is revealed. The modes of thermal holding (final technological heat treatment of the metal) were determined experimentally using the method of differential scanning calorimetry. The paper presents the results of changes in improving the properties of cast products due to the use of optimal modes of external complex influences.