摘要
用高能喷丸法对纯铁表面进行机械研磨时将镍粉引入表面，并通过随后热处理实现了表面铁镍合金化。采用OM、XRD和SEM研究其显微组织及分布形貌。结果表明，机械研磨后，镍粉均匀镶嵌在纯铁基体上并形成一层铁镍混合层，经过450℃退火后出现约100μm的FeNi合金层，且其成分沿深度呈梯度分布。载荷为15～55N时，表面合金化后摩擦系数和磨损量低于仅仅纳米化后的样品。表面合金化处理能进一步减弱纯铁的疲劳磨损效应，提高材料的摩擦磨损性能。
Nickel powders were added to a pure iron plate by the surface mechanical attrition treatment （SMAT） using high energy shot peening method,and the iron-nickel alloy layer of the iron plate was fabricated after heat treatment. Microstructure and morphology of the alloy layer were investigated by optical microscope （OM） , X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results show that a homogeneous iron-nickel mixture layer formes on the surface of the sample after SMAT, and a FeNi alloy surface layer with the thickness about 100 Ixm is generated on the sample annealed at 450 ℃. The gradient distrubution of the alloying element is observed in the surface layer along the depth of the alloyed sample. The friction coefficient and wear mass loss of the treated specimen is markedly lower than＇that of just SMAT sample without addition of nickel powders when the applied load is between 15 and 55 N. The alloying and nanocrystallization of the surface layer of the sample after SMAT with adding nickel powders and annealing treatment enhances fatigue wear performance and improves the friction and wear properties of the pure iron plate.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第11期164-169,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51001079
21201129
51374151)
山西省自然科学基金(2011011020-2
2010021023-1)
高等学校博士点专项科研基金(20091402110010)
中国博士后科学基金(20100471586)
山西省高等学校青年学术带头人支持计划
太原市创新创业人才专项(01922034)
关键词
纯铁
铁镍合金化
机械研磨
退火
摩擦磨损
pure iron
surface mechanical attrition treatment
annealing
friction and wear behavior
