Microstructure and mechanical properties of electron beam welded joint of Nb refractory metal to 304 austenitic stainless steel

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Refractory Metals & Hard Materials Pub Date : 2025-04-03 DOI:10.1016/j.ijrmhm.2025.107177

Zhanhua Gan , Guoqing Chen , Xinyan Teng , Lamei Zhang , Likuo Zhu , Xuesong Leng

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Abstract

In this study, the microstructure and mechanical properties of electron beam welded dissimilar joint of Nb to 304 austenitic stainless steel were analyzed. The results showed that the joint obtained were asymmetric due to the large difference in physical properties between the Nb and the 304 austenitic stainless steel. The weld mainly consisted of eutectic structure and brittle intermetallic compounds reaction layer. The eutectic phase was composed of α-Fe ferrite and ε(Fe₂Nb) intermetallic compound. The brittle phases in the reaction layer were ε(Fe₂Nb) and μ(Fe₇Nb₆). The microhardness of the reaction layer of the joint was up to 1065 HV, and the presence of ε(Fe₂Nb) in the eutectic region contributed to its high microhardness as well. The tensile strength of the welded joint was 137 MPa, which was 53 % of that of the Nb base metal. The joint failed at the reaction layer by brittle cleavage fracture.

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Nb 难熔金属与 304 奥氏体不锈钢电子束焊接接头的微观结构和机械性能

研究了Nb - 304奥氏体不锈钢异种接头电子束焊接的显微组织和力学性能。结果表明，由于Nb与304奥氏体不锈钢的物理性能差异较大，所得到的接头是不对称的。焊缝主要由共晶组织和脆性金属间化合物反应层组成。共晶相由α-Fe铁氧体和ε(Fe2Nb)金属间化合物组成。反应层的脆性相为ε(Fe2Nb)和μ(Fe7Nb6)。接头反应层的显微硬度高达1065 HV，共晶区有ε(Fe2Nb)的存在，导致其显微硬度较高。焊接接头的抗拉强度为137 MPa，为母材Nb的53%。接头在反应层发生脆性解理断裂。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.