<strong>Fe-15Mn-5Si-14Cr-0.2C</strong>非晶钢微观组织与腐蚀行为

doi:10.11900/0412.1961.2019.00275

金属学报

2020, Vol. 56

Issue (5): 715-722 DOI: 10.11900/0412.1961.2019.00275

本期目录 | 过刊浏览

Fe-15Mn-5Si-14Cr-0.2C非晶钢微观组织与腐蚀行为

赵燕春¹^,²(

), 毛雪晶¹, 李文生¹, 孙浩¹, 李春玲³, 赵鹏彪¹, 寇生中¹

1.兰州理工大学省部共建有色金属加工与再利用国家重点实验室兰州 730050
2.Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996-2200, USA
3.兰州理工大学机电工程学院兰州 730050

Microstructure and Corrosion Behavior of Fe-15Mn-5Si-14Cr-0.2C Amorphous Steel

ZHAO Yanchun¹^,²(

), MAO Xuejing¹, LI Wensheng¹, SUN Hao¹, LI Chunling³, ZHAO Pengbiao¹, KOU Shengzhong¹, Liaw Peter K.²

1.State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2.Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996-2200, USA
3.College of Mechano-Electronic Engineering, Lanzhou University of Technology, Lanzhou 730050, China

引用本文:

赵燕春, 毛雪晶, 李文生, 孙浩, 李春玲, 赵鹏彪, 寇生中. Fe-15Mn-5Si-14Cr-0.2C非晶钢微观组织与腐蚀行为[J]. 金属学报, 2020, 56(5): 715-722.
Yanchun ZHAO, Xuejing MAO, Wensheng LI, Hao SUN, Chunling LI, Pengbiao ZHAO, Shengzhong KOU, Peter K. Liaw. Microstructure and Corrosion Behavior of Fe-15Mn-5Si-14Cr-0.2C Amorphous Steel[J]. Acta Metall Sin, 2020, 56(5): 715-722.

全文: PDF(1970 KB) HTML

摘要:

采用水冷铜坩埚磁悬浮熔炼-铜模负压吸铸法制备了Fe-15Mn-5Si-14Cr-0.2C非晶复合材料棒状试样，通过XRD和EBSD对合金的微观组织进行表征，并研究试样室温压缩力学性能；采用电化学工作站三电极体系测试试样在人工海水中的腐蚀行为，并利用SEM和EDS观察和分析电化学腐蚀后的形貌及腐蚀产物。结果表明，Fe-15Mn-5Si-14Cr-0.2C非晶复合材料试样组织由非晶相+晶体相(CFe_15.1过冷奥氏体相和Fe-Cr铁素体相)组成，试样在室温环境下的综合力学性能优异，屈服强度、断裂强度和塑性应变分别为978 MPa、2645 MPa和35.8%。试样在人工海水中表现出良好的耐蚀性，与304不锈钢相比，Fe-15Mn-5Si-14Cr-0.2C非晶复合材料自腐蚀电位大，自腐蚀电流密度低，极化电阻高，容抗弧半径大且只有一个高频容抗弧，只受电极电位的影响，腐蚀的动力学速率低，钝化膜稳定致密，具有成为新一代海洋工程耐蚀材料的潜力。

关键词 ：非晶钢, 微观组织, 力学性能, 腐蚀行为

Abstract：

Amorphous steels exhibit ultra-high strength but room-temperature brittleness and strain-softening behavior as loading, which restricted the application of amorphous steels as high-performance structural material. Developing in situ crystals is an effective way to toughen the amorphous alloys. However, the crystals may sacrifice the corrosion resistance of amorphous steels. In this work, austenite and ferrite duel phases were introduced to the amorphous phase, via transformation induced plasticity (TRIP) of the austenite as loading, to enhance the ductility and improve the work-hardening behavior; and via the synergy of ferrite and amorphous phase to ensure the corrosion resistance. A novel amorphous steel Fe-15Mn-5Si-14Cr-0.2C was fabricated by magnetic suspension melting in a water-cooled copper crucible, and negative pressure suction casting into a copper mold. The microstructure and mechanical properties of the amorphous steel were characterized by XRD, EBSD and the electronic universal testing machine. The corrosion behavior in artificial seawater was studied on an electrochemical work station with a three-electrode system, and the corrosion morphology and corrosion products were characterized by SEM with EDS analysis. The results showed that the as-cast amorphous steel consisted of the amorphous matrix, CFe_15.1 super-cooled austenite and Fe-Cr ferrite phases. From surface to inner, amorphous phases mainly exist in the margin, while crystalline phases are abundantly distributed in the center. The amorphous steel exhibited excellent comprehensive mechanical properties at room temperature, and its yield strength, fracture strength and plastic strain were up to 978 MPa, 2645 MPa and 35.8%, respectively. In artificial seawater, compared with 304 stainless steel, the amorphous steel showed high self-corrosion potential, low self-corrosion current density and high polarization resistance, large resistance arc radius, only one high frequency resistance arc and low corrosion kinetic rate. Moreover, the stable and dense passivation film was observed on the corrosion surface. Their excellent corrosion resistance and mechanical properties endow the amorphous steel with the potential to become a novel corrosion-resistant structural material for marine engineering.

Key words： amorphous steel microstructure mechanical property corrosion behavior

收稿日期: 2019-08-19

ZTFLH:

TG139.8

基金资助:国家自然科学基金项目(51661017);国家留学基金项目(201808625027);甘肃省杰出青年基金项目(17JR5RA108);兰州理工大学红柳优秀青年基金项目

作者简介: 赵燕春，女，1984年生，副教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00275 或 https://www.ams.org.cn/CN/Y2020/V56/I5/715

图1 Fe-15Mn-5Si-14Cr-0.2C铸态和加载断裂后试样XRD谱

图2 Fe-15Mn-5Si-14Cr-0.2C铸态试样室温工程应力-应变曲线

图3 直径2 mm的Fe-15Mn-5Si-14Cr-0.2C铸态试样和断后试样横截面区域的EBSD像

图4 298 K下直径2 mm的Fe-15Mn-5Si-14Cr-0.2C试样与304不锈钢在人工海水中的极化曲线

表1 298 K下直径2 mm的Fe-15Mn-5Si-14Cr-0.2C试样与304不锈钢在人工海水中的腐蚀参数

图5 Fe-15Mn-5Si-14Cr-0.2C试样与304不锈钢在人工海水中的交流阻抗图

图6 Fe-15Mn-5Si-14Cr-0.2C试样腐蚀后边缘区域和中心区域的SEM像

表2 Fe-15Mn-5Si-14Cr-0.2C合金腐蚀后边缘区域和中心区域的EDS分析结果 (mass fraction / %)

图7 Fe-15Mn-5Si-14Cr-0.2C试样腐蚀后的SEM-BS像

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