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Development of a new high-density iron-tungsten alloy (FWA) reinforced by Fe7W6 and Fe2W particles with high tensile strength and specific strength
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jallcom.2020.157323
Wanli Song , Liujie Xu , Kangning Shan , Yucheng Zhou , Fangnao Xiao , huahai shen , Shizhong Wei

Abstract This paper develops a new type of high-density iron-tungsten alloy (FWA) with high hardness and tensile strength by adding 15.6 wt% W into DT300 steel. The microstructure of FWA is characterized by separated network-like Fe7W6 around the grain boundary of ɑ-Fe matrix and nano-scale fine Fe2W particles are evenly distributed in the ɑ-Fe matrix, with some dispersive SiO2 particles. The new FWA has higher elastic modulus, micro-hardness, and tensile strength compared to DT300 steel. The micro-hardness and tensile strength of the FWA are 716.6 HV and 1267.7 MPa, which are approximately 18.1% and 6.5% higher than those of DT300 steel, respectively. The specific strength of new FWA is 1.49*105 (N/m2)/(kg/m3), which is 1.8–4 times higher than that of tungsten heavy alloys. The high strength of FWA is attributed to the strengthening of the multiscale iron-tungsten intermetallic compound.

中文翻译:

由 Fe7W6 和 Fe2W 颗粒增强的新型高密度铁钨合金 (FWA) 的开发,具有高拉伸强度和比强度

摘要 本文通过在DT300钢中添加15.6 wt%的W,开发出一种具有高硬度和抗拉强度的新型高密度铁钨合金(FWA)。FWA的微观结构特点是在ɑ-Fe基体的晶界周围呈分离的网络状Fe7W6,纳米级细小的Fe2W颗粒均匀分布在ɑ-Fe基体中,并带有一些分散的SiO2颗粒。与 DT300 钢相比,新型 FWA 具有更高的弹性模量、显微硬度和抗拉强度。FWA 的显微硬度和抗拉强度分别为 716.6 HV 和 1267.7 MPa,分别比 DT300 钢高约 18.1% 和 6.5%。新型FWA的比强度为1.49*105(N/m2)/(kg/m3),比钨重合金高1.8-4倍。
更新日期:2021-02-01
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