表面强化对随钻测井设备用C17200铍青铜基体组织和性能的影响

doi:10.13251/j.issn.0254-6051.2023.06.019

摘要/Abstract

摘要： 针对C17200铍青铜随钻测井设备早期疲劳失效案例, 研究两种表面强化工艺对铍青铜基体组织和性能的影响, 探究失效机理, 确定适合的强化工艺。采用激光熔覆和超音速火焰喷涂(HVOF)陶瓷涂层的适配头, 对比分析有涂层和无涂层部位的组织和性能。采用光学显微镜(OM)+扫描电镜(SEM)表征基材显微组织, 用高分辨场发射电镜(FESEM)+能谱仪(EDS)表征铍青铜过时效组织晶界和晶内的相组成;用硬度计和材料试验机测试力学性能。结果表明, 激光熔覆的热输入对铍青铜基材的组织和力学性能产生不利影响, 基材局部温度达到350 ℃, 组织发生过时效, 晶界反应量增多出现大量γCu88Be12节瘤组织, 基材软化, 硬度最低值仅为12 HRC, 强度下降。HVOF对基材的组织和性能没有造成影响, 未出现过时效组织, 采用HVOF喷涂陶瓷涂层可提高适配头的使用可靠性和安全性, 适合C17200铍青铜随钻测井设备的表面强化。

关键词: C17200铍青铜, 疲劳断裂, 组织与性能, 超音速火焰喷涂(HVOF), 激光熔覆, 过时效

Abstract: According to fatigue failure case of C17200 beryllium bronze logging while drilling (MWD) equipment, the influence of two different surface strengthening processes on microstructure and properties of the C17200 beryllium bronze substrate were investigated, and the failure mechanism was discussed, then the suitable strengthening process was determined. Laser cladding and high-velocity oxygen-fuel (HVOF) were adopted to clad ceramic coating on the adapter. The microstructure and properties of coated and uncoated specimens were compared and analyzed. Optical microscope (OM) and scanning electron microscope (SEM) were used to characterize microstructure of the substrate, and a high-resolution field emission scan electron microscopy (FESEM) and energy dispersive spectrometer (EDS) was used to characterize the grain boundary phase and intragranular phase composition of the over-aged microstructure of the beryllium bronze. The mechanical properties were tested by means of hardness meter and material testing machines. The results show that the heat input of laser cladding has an adverse effect on microstructure and mechanical properties of the beryllium bronze substrate. The local temperature of the substrate reaches 350 ℃, the microstructure is over-aged, and the increase of grain boundary reaction brings a large number of γCu88be12 nodules which results in the strength decreases and the lowest hardness of the substrate is only 12 HRC. However, the HVOF has little effect on microstructure and properties of the substrate, and the microstructure and properties are normal without aged structure. It is concluded that the HVOF sprayed ceramic coating can improve the reliability and safety of the adapters, which is suitable for the surface reinforcement of C17200 beryllium bronze for MWD equipment.

Key words: C17200 beryllium bronze, fatigue fracture, microstructure and properties, high-velocity oxygen-fuel (HVOF), laser cladding, over aging

中图分类号:

TG178

徐志刚, 杨阳, 杨中娜, 药小江, 秦才会, 王海朋, 刘亮. 表面强化对随钻测井设备用C17200铍青铜基体组织和性能的影响[J]. 金属热处理, 2023, 48(6): 107-113.

Xu Zhigang, Yang Yang, Yang Zhongna, Yao Xiaojiang, Qin Caihui, Wang Haipeng, Liu Liang. Effect of surface strengthening on microstructure and properties of C17200 beryllium bronze substrate for logging while drilling equipment[J]. Heat Treatment of Metals, 2023, 48(6): 107-113.

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