AISI 304不锈钢表面Fe3Si型硅化物渗层制备及其力学性能
Preparation of Fe3Si Type Transition-metal Silicide Layer Deposited on AISI 304 Stainless and Its Mechanical Property
安 亮1, 马 勤1,2, 贾建刚1,2, 李 鹏1
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作者单位：1. 兰州理工大学 甘肃省有色金属新材料省部共建国家重点实验室, 甘肃 兰州 730050; 2. 兰州理工大学 有色金属合金省部共建教育部重点实验室, 甘肃 兰州 730050)
中文关键字：Fe3Si； 硅化物渗层； AISI 304不锈钢； 名义屈服应力； 轴向拉伸
英文关键字：Fe3Si; silicide layer; AISI 304 stainless steel; nominal yield stress; axial tension
中文摘要：采用NaCl ∶ KCl ∶ NaF=2 ∶ 2 ∶ 1(摩尔比)的中性熔融盐作为载体，Na2SiF6 ∶ Si=8 ∶ 2粉末作为渗硅剂，以SiO2为助渗剂，800 ℃下渗硅5 h可实现在AISI 304不锈钢表面形成厚约600 μm的富含Cr、Ni合金元素的Fe3Si型硅化物渗层。采用万能材料试验机进行了轴向拉伸试验，并对应力-应变曲线进行了分析。结果表明，硅化物渗层为脆性断裂，基体部分为塑性断裂；AISI 304不锈钢渗硅后的名义屈服应力有明显提高。
英文摘要：Fe3Si type silicide layer containing Cr and Ni alloying elements with a thickness of about 600 μm deposited on AISI 304 stainless steel was formed in molten salts at 800 ℃ for 5 h using molten mixture of Na2SiF6 ∶ Si=8 ∶ 2 as siliconizing agent and the molten halogenide of alkali metals of NaCl ∶ KCl ∶ NaF=2 ∶ 2 ∶ 1 as siliconizing agent carrier by adding SiO2 as another source. The tension behavior of the samples was tested on an universal tension apparatus, the stress-strain curves were analysed as well. The results show that the brittle fracture occurs in the layer and the ductile fracture occurs in the matrix; nominal yield stress of the siliconized sample is significantly improved.