摘要
为改善GH202镍基高温合金的表面性能,使用成分为C^(n+)和H^+、加速电压为250kV的强脉冲离子束(IPIBs)对其进行表面辐照处理。采用光学显微镜、X射线衍射仪、扫描电子显微镜和显微硬度计等分别对不同参数辐照后的试样的表面形貌及性能进行测试。结果表明:辐照后GH202合金表面产生了熔坑,熔坑的尺寸随能量密度的增加而增加,最大可至70μm。熔坑的产生源于表层低熔点组分的喷发。表层的γ'相消失,辐照之后的试样表层产生了M_(23)C_6结构的碳化物并在辐照过程中受到压应力作用。辐照后试样表层近百微米深度内显微硬度均获得不同程度的提高。在高温氧化时,辐照后的样品表面更易于形成Cr_2O_3和Al_2O_3连续膜层氧化物,阻碍O元素向基体扩散,使得抗高温氧化性能得到改善。
In order to improve the surface properties of GH202 nickel based superalloy, intense pulsed ion beams （IPIBs）, composited by C^＋ and H^＋, accelerated by 250 kV voltage, were used to irradiate the alloy, The surface morphology and properties of the alloys were detected by optical microscopy, XRD, SEM and microhardness tester. The results show that the craters appear on the sample surface after IPIBs irradiation. The size of craters increases with the improvement of the energy density, up to 70 pro. The formation of craters is due to the eruption of low melt point components. The γ＇ phase on the surface layer is disappeared, the carbide with M23C6 structure formed and the residual stress existed. In depth of about 100 μm, the microhardness after irradiation increases in varying degrees. In the high temperature oxidation testing, the continuous oxidation layer consisting of Cr2O3 and Al2O3 is easier to be formed, which can prevent the diffusion of oxygen into the substrate. There-fore, high temperature oxidation resistance of the treated alloy has been improved.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2018年第1期7-14,共8页
China Surface Engineering
基金
国家自然科学基金(11175012)
国家重大科技专项f2013ZX04001071.004)
关键词
强脉冲离子束
镍基高温合金
熔坑
显微硬度
抗高温氧化性能
intense pulsed ion beams（IPlBs）
nickel based superalloy
craters
microhardness
high temperature oxidationresistance
