AISI304不锈钢表面Fe_3Si型硅化物渗层制备及其力学性能  

Preparation of Fe_3Si Type Transition-metal Silicide Layer Deposited on AISI 304 Stainless and Its Mechanical Property

作　　者：安亮[1] 马勤[1,2] 贾建刚[1,2] 李鹏[1] 

机构地区：[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

出　　处：《热加工工艺》2011年第22期134-136,共3页Hot Working Technology

基　　金：青年科学基金资助项目(51001057)

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5h可实现在AISI 304不锈钢表面形成厚约600μm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。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.

关 键 词：FE3SI 硅化物渗层 AISI304不锈钢 名义屈服应力 轴向拉伸 

分 类 号：TG156.8[金属学及工艺—热处理]