Experimental and numerical investigations on the microstructural features and mechanical properties of explosive welded niobium-steel interface

Junfeng Xu; Honghao Ma; Ming Yang; Zhaowu Shen; Bingyuan Zhang; Tianan Rui; Ruijin Zhao

Materials & Design (Jun 2022)

Experimental and numerical investigations on the microstructural features and mechanical properties of explosive welded niobium-steel interface

Junfeng Xu,
Honghao Ma,
Ming Yang,
Zhaowu Shen,
Bingyuan Zhang,
Tianan Rui,
Ruijin Zhao

Affiliations

Junfeng Xu: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern, Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, China
Honghao Ma: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern, Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, China; State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China; Corresponding authors at: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern, Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, China.
Ming Yang: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern, Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, China; National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China; Corresponding authors at: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern, Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, China.
Zhaowu Shen: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern, Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, China
Bingyuan Zhang: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern, Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, China
Tianan Rui: Nanjing Baotai Special Materials Co., Ltd, Nanjing 211100, China
Ruijin Zhao: Nanjing Baotai Special Materials Co., Ltd, Nanjing 211100, China

Journal volume & issue: Vol. 218
p. 110716

Abstract

Read online

The microstructural characteristics of the explosive welded niobium-steel interface were systematically investigated by various characterizations and a two-step numerical simulation. A coupled Lagrange-Eulerian simulation was firstly developed to compute the impact velocity, this model allows to establish an accurate impact condition. Microstructure observations show that the niobium-steel interface is featured by a wave structure with two vortices located at the wave front and back, and micro defects like voids and cracks were detected inside the vortex. Grains of the niobium and steel matrix near the interface were characterized by elongated and fine equiaxed structures, respectively, while that in vortex area was fine columnar grains. Then, the interfacial thermokinetics was investigated by a smoothed particles hydrodynamics simulation to reveal the formation of the observed defects and diverse grains. The ultimate strength of the composite exceeds 350 MPa with disparate heat-treated temperatures obtained by the tensile tests. Meanwhile, tensile-shear test shows a robust bonding strength of 220 MPa. The strong mechanical properties of the composite guarantee a great prospect of its application in the nuclear industry.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

About the journal

Abstract

Keywords