Affiliation:
1. Jiangsu Key Laboratory of Materials Surface Science and Technology, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou 213164, China
2. Huaide College, Changzhou University, Jingjiang 214500, China
3. Integrated Management Department, Jiangsu Shuangliang Boiler Co., Ltd., Jiangyin 214444, China
Abstract
The low-temperature impact toughness of nodular cast iron can be significantly enhanced by heat treatment, and thus meet the severe service requirements in the fields of high-speed rail and power generation, etc. In order to explore the enhancement mechanism, microstructure, hardness, composition and other characteristics of as-cast and heat-treated nodular cast iron is systematically tested and compared by optical microscopy, microhardness tester, EBSD, SEM, electron probe, and impact toughness testing machine in this study. The results show that heat treatment has little effect on the morphology and size of graphite in nodular cast iron, ignores the effect on the grain size, morphology, and distribution of ferritic matrix, and has little effect on the hardness and exchange of elements, while it is meaningful to find that heat treatment brings about significant decrease in high-angle grain boundaries (HAGB) between 59° and 60°, decreasing from 10% to 3%. Therefore, the significant enhancement of low-temperature impact toughness of nodular cast iron by heat treatment may result from the obvious decrease in HAGB between 59° and 60°, instead of other reasons. From this perspective, the study can provide novel ideas for optimizing the heat treatment process of nodular cast iron.
Funder
National Natural Science Foundation of China
Natural Science Foundation for Young Scholars of Jiangsu Province
National Natural Science Foundation for Young Scholars of China
Priority Academic Program Development of Jiangsu Higher Education Institutions
Top-notch Academic Program Projects of Jiangsu Higher Education Institutions
Subject
General Materials Science
Reference24 articles.
1. A preliminary investigation of strength models for degenerate graphite clusters in grey cast iron;Cova;Procedia Struct. Integr.,2017
2. Full-scale fatigue testing of a cast-iron wind turbine rotor shaft;Kyling;Forsch. Ingenieurwesen,2023
3. Improvement of toughness of high chromium white cast iron: Duplex ferritic-austenitic matrix;Jena;Mater. Sci. Technol.,2018
4. Scacco, F., Campagnolo, A., Franceschi, M., and Meneghetti, G. (2022). Strain-Controlled Fatigue Behavior of a Nodular Cast Iron in Real Off-Highway Axles: Effects of Casting Skin and Strain Ratio. Metals, 12.
5. A Study of the Low-Temperature Property of Nodular Iron;Shama;Mater. Today Proc.,2019