机械合金化制备Fe-Cr-Mn-N奥氏体不锈钢厚熔覆涂层的研究

Preparation of Fe-Cr-Mn-N austenitic stainless steel thick cladding coating by mechanical alloying

摘要:

本实验采用机械合金化方法制备了Fe₇₆Cr₁₂Mn₁₂N合金粉末,研究其机械合金化过程,并对机械合金化的机制进行探讨。研究表明,棒磨4小时时粉末就可以完全合金化,并且随着棒磨时间增加,衍射峰逐渐宽化,衍射强度逐渐降低。粉末颗粒形貌也逐渐类球形化。机械合金化得到的非球形固溶体粉末也可用于激光熔化沉积(LMD)增材制造技术,解决了LMD对球形粉末的局限性,机械合金化粉末通过LMD技术得到的厚熔覆涂层具有较好的耐蚀性,其物相结构是BCC+FCC的双相结构,同时在打印过程中有Cr₂N生成,维氏硬度最高达到456.3HV。

关键词:耐蚀性;机械合金化;激光熔化沉积

Abstract:

In the experiment, Fe76cr12mn12n alloy powder was prepared by mechanical alloying. The mechanical alloying process and mechanism were studied. The results show that the powder can be fully alloyed after 4 hours of rod milling. The diffraction peak widens and the diffraction intensity decreases with the increase of rod milling time,. The morphology of the powder particles gradually became spherical. The non-spherical solid solution powders obtained by mechanical alloying can also be used in laser melting deposition (LMD) additive manufacturing technology, which solves the limitation of LMD to spherical powder. The thick cladding coating obtained by LMD technology has good corrosion resistance, and it shows BCC+ FCC dual phase structure. Meanwhile, Cr2N is generated in the printing process. the Vickers hardness of thick coating could reach up to 456.3 HV.

Key words:Austenitic stainless steel; Mechanical alloying; Laser melting deposition