不锈钢表面激光熔覆原位生成Fe-Mn-Si记忆合金涂层研究  

In Situ Synthesis of Fe-Mn-Si Memory Alloy on the Surface of Stainless Steel by Laser Cladding

作　　者：周超玉[1] 林成新[1] 徐鹏[1] 孙德平[1] 鞠恒 

机构地区：[1]大连海事大学,辽宁大连116026

出　　处：《稀有金属材料与工程》2014年第12期3042-3046,共5页Rare Metal Materials and Engineering

基　　金：高等学校博士学科点专项科研基金资助课题(20122125120013);中央高校基本科研业务费专项资金资助(2012TD011;3132013060;3132013311;3132014052)

摘　　要：利用5 kW横流CO2激光器,在304不锈钢表面激光熔覆原位生成Fe17Mn5Si10Cr4Ni记忆合金涂层并利用金相显微镜、场发射扫描电镜、X射线衍射仪、往复摩擦仪等仪器设备对熔覆层显微组织、微区成分、摩擦磨损性能进行了分析研究。结果表明,Fe-Mn-Si记忆合金涂层自顶端到熔合界面分别由等轴晶、树枝晶、柱状树枝晶、胞状晶和平面晶组成;激光熔覆原位生成Fe-Mn-Si记忆合金涂层过程中,熔覆层内残余应力驱动诱发了γ→ε马氏体相变,相变变形可松弛熔覆层的残余应力;Fe-Mn-Si记忆合金涂层与304不锈钢基材相比,摩擦系数小、耐磨性好,磨损机制为磨粒磨损,摩擦力诱发γ→ε马氏体相变是熔覆层耐磨性得到显著提升的根本原因。Fel7Mn5Sil0Cr4Ni memory alloy coatings were prepared by in situ synthesis on the surface of 304 stainless steel by 5 kW transverse flow CO2 laser. The metallographic microscope and FESEM analyses show that the Fe-Mn-Si coating is composed of equiaxed crystals, dendritic crystals, columnar dendritic crystals, cellular crystals and plane crystals from the top to the fusion interface. The XRD results reveal that the residual stress of in situ synthesis of coatings induces γ→ε phase transformation, and the phase transformation strain can relax the residual stress. Wear resistance tests indicate that frictional properties of this coating are better than that of the surface of 304 stainless steel, and the wear mechanism is particle wear. The friction stress-induced y---~e phase transformation is the root cause for enhanced wear resistance of SMA coatings

关 键 词：激光熔覆 Fe-Mn-Si记忆合金涂层 应力诱发γ→ε马氏体相变 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG139.6[金属学及工艺—金属学]