Work

Enhanced interfacial joining strength of joined high chromium gray cast iron/low carbon steel joint via graphite coating

Year: 2024

Type: article

Abstract: Liquid-state bonding is one of the most crucial methods in joining dissimilar materials to manufacture composites with structural design. The high chromium gray cast iron (HCGCI)/low carbon steel (LCS) composite structure is attractive in mining industries due to its superior mechanical properties and low density. However, the decarburization of the faying surface of HCGCI leads to the formation of a coarse-grained brittle interlayer between HCGCI and LCS which seriously deteriorates the mechanical properties of welded joints. In this work, high chromium gray cast iron/low carbon steel composite was fabricated by diffusion bonding via graphite coating layer. The results showed that the graphite coating on the fusion surfaces prevented the decarburization of HCGCI and the growth of coarse grains which improved the bonding quality. The ultimate tensile strength and total elongation of the graphite-free sample are 335.6 MPa and 8.9%, respectively. In contrast, the ultimate tensile strength and total elongation of the graphite-contain sample are 435.6 MPa and 17.9%, separately. This work opens a new strategy for fabricating high chromium gray cast iron/low carbon steel composite, and the flexibility to achieve complex structures through liquid-state bonding is extended.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2024.11.066

Authors: Zelin Yan, Shuang Liu, Yingfan Zhao, Xiangpeng Chang, Weiping Tong

Institution: Northeastern University

Language: English

Topic: Advanced Welding Techniques Analysis

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,430

Funders: National Natural Science Foundation of China, Northeastern University