固溶温度对Ag2205双相不锈钢组织与性能的影响

来源期刊:中南大学学报(自然科学版)2019年第5期

论文作者:向红亮 陈盛涛 邓丽萍

文章页码:1056 - 1065

关键词:Ag2205双相不锈钢;力学性能;耐蚀性能;抗菌性能

Key words:Ag-bearing 2205 duplex stainless steel; mechanical property; corrosion resistance; antibacterial property

摘    要:通过添加Cu–Ag合金颗粒制备Ag2205双相不锈钢,并分别在1 050,1 075,1 100,1 125和1 150 ℃对其进行固溶处理;利用光学显微镜、扫描电子显微镜、拉伸试验、电化学工作站及覆膜法等研究固溶温度对Ag2205双相不锈钢组织、力学性能、耐蚀性能及抗菌性能的影响,并与母材2205及Cu2205不锈钢的实验结果进行对比分析。研究结果表明:随着固溶温度的升高,Ag2205材料内γ相体积分数逐渐降低且γ相先变粗后细化,而α相体积分数逐渐提高;此外,微米级的含Ag相主要分布于α基体及α/γ相界处,升高固溶温度会促进Ag相溶解;随着固溶温度的升高,含Ag材料洛氏硬度和抗拉强度均先降低后升高,但伸长率持续增大,当固溶温度为 1 150 ℃时,Ag2205综合力学性能最佳且优于母材与含Cu2205材料的力学性能;Ag的加入会降低2205材料的耐蚀性,但提高固溶温度可改善其耐蚀性能,且在1 125 ℃固溶后,其耐蚀性已优于母材耐蚀性;3种材料中,Cu2205材料的耐蚀性最好;当固溶温度大于等于1 075 ℃时含Ag材料具有优异的抗菌性能,Cu2205材料及母材则不具备抗菌效果。

Abstract: Ag-bearing 2205 duplex stainless steel was prepared by adding Cu–Ag alloy particles, followed by solution treatment at 1 050, 1 075, 1 100, 1 125 and 1 150 oC, respectively. The effects of solution temperature on microstructure, mechanical properties, corrosion resistance and antibacterial property of Ag-bearing 2205 duplex stainless steels were studied by means of optical microscope(OM), scanning electron microscope(SEM), tensile test, electrochemical workstation and film mulching method. Meanwhile, parent material 2205 as well as Cu-bearing 2205 was prepared as references. The results show that with the increase of solution temperature, the volume fraction of γ decrease, and γ coarsens first and then shrinks while the volume fraction of α increases. In addition, the Ag phase in micro scale is distributed in α phase and at the α/γ boundaries, and the increase of solution temperature promotes the dissolution of Ag phase. The Rockwell hardness as well as tensile strength of Ag-bearing material decreases first and then increases with the rise of solution temperature, while the elongation rate goes up as the temperature increases. The comprehensive mechanical properties of Ag2205 are the best and superior to that of parent material 2205 as well as Cu-bearing 2205 after solution treatment at 1 150 oC. Addition of Ag reduces the corrosion resistance of 2205 material, whereas the increase of solution temperature improves the corrosion resistance. The corrosion resistance of Ag2205 is better than that of parent material after solution treatment at 1 125 oC. The corrosion resistance of Cu-bearing 2205 is the best among 3 kinds of materials. Ag-bearing materials after solution treatment at 1 075 oC or above possess excellent antibacterial properties, whereas both Cu-bearing 2205 and parent material do not show antibacterial effect.

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