Effect of Zr on microstructure and mechanical properties of 304 stainless steel joints brazed by Ag-Cu-Sn-In filler metal

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外文摘要：The effect of Zr on the microstructure and mechanical properties of 304 stainless steel joints brazed with Ag-Cu fillers was studied.The incorporation of Zr had little effect on the solid-liquid phase line of the fillers,and the melting temperature range of the fillers was narrowed,which enhanced their fluidity and wettability.The presence of Zr in the form of heterogeneous particles augmented the nucleation rate during solidification,transforming the intermittently distributed gray-black coarse dendrites into cellular crystals.This structural transformation led to fragmentation and refinement of the microstructure.The dissolution of Zr into Ag and Cu promoted the transformation of low-angle grain boundaries to high-angle grain boundaries(HAGBs),hindering crack propagation.Zr element in the brazing seam led to grain refinement and increased density of grain boundaries.The grain refinement could disperse the stress,and HAGBs could resist the dislocation movement,improving the joint strength.The results display that when Zr content was 0.75 wt.%,the maximum strength was 221.1 MPa.The fracture occurred primarily at the brazing seam,exhibiting a ductile fracture.

外文关键词：

Active elementAg-Cu fillerStainless steelBrazingMechanical property

作者：

Ling-ling Huang、Jian Qin、Jun-lan Huang、Hua Yu、Chao Jiang、Lu-yang Song、Zhuo-li Yu、Zhi-qian Liao、Yan-zhao Cai、Li Ma、Shi-zhong Wei

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作者单位：

School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471000,Henan,China

National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Henan University of Science and Technology,Luoyang 471000,Henan,China

State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450001,Henan,China

Luoyang Ship Material Research Institute,Luoyang 471039,Henan,China

Avic Jonhon Optronic Technology Co.,Ltd.,Luoyang 471039,Henan,China

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基金：

National Natural Science Foundation of China Key ProjectsNatural Science Foundation of Henan Provincial Science and Technology DepartmentHenan Province Science and Technology Research and Development Plan Joint Fund Project

项目编号：

U22A20191232300420088225200810013

出版年：

2024

DOI：

10.1007/s42243-024-01339-7

钢铁研究学报(英文版)

钢铁研究总院

钢铁研究学报(英文版)

CSTPCD

影响因子：0.584

ISSN：1006-706X

年,卷(期)：2024.31(10)