The Microstructure and Mechanical Properties of TA1-Low Alloy Steel Composite Plate Manufactured by Explosive Welding

Ye Cui,Yang Zhang,Lixin Sun,Mingyu Fan,Zhongwu Zhang,Di Liu,Dan Chen,Guangping Deng

doi:10.3390/met10050663

Ye Cui, Yang Zhang + Show 6 more

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https://doi.org/10.3390/met10050663

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Abstract

A TA1 (Ti alloy)/low alloy steel (LAS) composite plate was manufactured by explosive welding. The effects of the bonding interface microstructure on the mechanical properties and fracture behavior of the composite plate were investigated. The results show that the interface has a wavy structure with intermetallic compounds (IMCs) enclosed by a steel matrix. The metallurgical bonding interface was achieved by local diffusion, with a several micrometer-thick diffusion layer. Two kinds of microcracks were formed in the IMC region and the diffusion interface. Microcracks in the IMC region propagate with difficulty due to the impediment of the IMC/steel interface. The microcracks initiated at the interface need to propagate into the fine-grain steel matrix before crack connection and delamination. The shear strength of the TA1/LAS composite plate was over 350 MPa. The composite plate could be bent up to the equipment limit (135 degrees). Excellent mechanical properties were obtained since the crack propagation was hindered by the refined or elongated steel grains induced during explosive welding.

Highlights

Titanium alloys are used widely in aviation, aerospace, nuclear power generation, and marine and petrochemical engineering for their light weight, excellent mechanical properties at room and elevated temperatures, and good corrosion resistance [1,2]
The objective of this work is to analyze the effect of bonding interface microstructure on the mechanical properties and crack propagation of dissimilar Ti/steel composite plates
An elongated grain region was formed adjacent to the equiaxed grain region. These equiaxed grains were produced by dynamic recrystallization; the thickness of equiaxed grain regions in the wave crest region is larger than that of the wave trough region, due to the temperature in the wave crest region. These results reveal that the high friction of steel and Ti induces a large amount of plastic deformation in the matrix, which results in reveal that the high friction of steel and Ti induces a large amount of plastic deformation in the significantly refined/elongated grains in the steel plates

Summary

Introduction

Titanium alloys are used widely in aviation, aerospace, nuclear power generation, and marine and petrochemical engineering for their light weight, excellent mechanical properties at room and elevated temperatures, and good corrosion resistance [1,2]. Structural steels are low-cost and can offer high strength to composite plates. In combination with the functional properties of Ti alloys and the low cost of structural steels, the production cost of composite plates can be minimized, which is advantageous for promoting the wide application of the composite plate. The production of a composite plate with Ti alloys and steels requires a reliable bonding interface between these dissimilar alloys. Different welding techniques have been used to produce Ti/steel composite plates [3,4,5,6,7,8]. Balasubramanian produced Ti/steel joints by diffusion welding

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