能量输出幅度对电火花沉积Ni201修复层界面行为的影响

发布时间：2018-01-24 11:40

本文关键词： 电火花沉积再制造 Q钢修复层界面行为残余应力　出处：《表面技术》2015年12期 　论文类型：期刊论文

【摘要】：目的获得电火花沉积质量较好的Ni201修复层。方法运用电火花沉积技术,采用DHD-6000型电火花沉积设备在Q235钢表面制备Ni201修复改性层,利用电子扫描显微镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)等检测方法,研究修复层与基体结合界面的微观结构、元素分布、相组成以及修复层表面残余应力。结果 Ni201修复层组织均匀致密,基体与修复层之间发生元素扩散;修复层结合界面处主要由Fe10.8Ni、γ(Fe,Ni)固溶体、Co Fe15.7及Fe相组成;Ni201修复层表面残余应力随能量输出幅度的增加而增大,在40%与45%能量输出条件下,残余应力分别为-38.1,-81.6 MPa,残余应力较小。结论 Q235钢基体与Ni201修复层元素相互扩散,基体与修复层之间形成了冶金结合,Ni201修复层为冶金结合层。再制造修复设备工艺参数选择是决定修复层质量的关键因素,能量输出幅度为40%的修复层质量优于能量输出幅度为45%。
[Abstract]:Objective to obtain Ni201 repair layer with good quality of EDM deposition. The modified Ni201 repair layer was prepared on the surface of Q235 steel by DHD-6000 type EDM deposition equipment. The modified layer was prepared by scanning electron microscope (SEM) and the energy spectrometer (EDS) was used to fabricate the modified layer of Ni201 on the surface of Q235 steel. X-ray diffraction (XRD) method was used to study the microstructure and element distribution of the interface between the repair layer and the matrix. Results the microstructure of the Ni201 repair layer was uniform and dense, and the element diffusion occurred between the matrix and the repair layer. The interface of the repair layer is mainly composed of Fe 10.8Ni, 纬 -Fe Ni) solid solution (Co Fe15.7 and Fe phase). The residual stress on the surface of the Ni201 repair layer increases with the increase of the energy output amplitude. At the condition of 40% and 45% energy output, the residual stress is -38.1 ~ 81.6 MPa, respectively. Conclusion the elements of Q235 steel matrix and Ni201 repair layer diffused each other, and the metallurgical bond between the matrix and repair layer was formed. The Ni201 repair layer is a metallurgical bonding layer. The selection of process parameters of the remanufacturing repair equipment is the key factor to determine the quality of the repair layer. The repair layer with an energy output amplitude of 40% is better than the energy output layer with a magnitude of 45.
【作者单位】：江西理工大学机电工程学院;
【基金】：国家自然科学基金(50965008) 江西省教育厅科技计划项目(GJJ14424)~~
【分类号】：TG174.44
【正文快照】： 电火花沉积(Electro-Spark Deposition,ESD)作为重要的表面强化修复技术,对受损机械零部件的修复及再制造具有重要意义,其实质是一种微弧焊接工艺[1],与电刷度、激光熔覆和热喷涂等表面强化技术相比,电火花沉积具有对基体热输入低、沉积层结合强度高等工艺特点以及成本低、修

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