基于回归分析的Mar M247镍基高温合金喷砂工艺预测与优化  

Prediction and Optimization of Sandblasting Process for Mar M247 Nickel-based Superalloy Based on Regression Analysis

作　　者：骆晓雨 方伦彬 袁小虎 乔翔 赖建平 余家欣 LUO Xiaoyu;FANG Lunbin;YUAN Xiaohu;QIAO Xiang;LAI Jianping;YU Jiaxin(School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Sichuan Mianyang 621010,China;State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment,Sichuan Deyang 618000,China;School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Market Supervision Administration of Changsha County,Changsha 410100,China)

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010 [2]清洁高效透平动力装备全国重点实验室,四川德阳618000 [3]重庆大学材料科学与工程学院,重庆400044 [4]长沙县市场监督管理局,长沙410100

出　　处：《表面技术》2024年第17期176-185,195,共11页Surface Technology

基　　金：国家科技重大专项(2019-711-0007-0147);国家重点研发计划(2020YFB2010402);西南科技大学研究生创新基金(24ycx2044);清洁高效透平动力装备全国重点实验室开放课题(DEC8300CG202319357EE280491)。

摘　　要：目的针对燃机叶片用MarM247镍基高温合金,建立多因素喷砂工艺的高精度预测模型,筛选出粗糙度较高而夹砂率较低的工艺组合。方法采用国产精工自动化精控喷砂系统制备试样。使用便携式表面粗糙度仪、激光显微镜和扫描电子显微镜进行检测。基于数理统计的分析方法,建立喷砂工艺与表面质量之间的函数关系。结果当喷砂角度从30°增至90°时,粗糙度和夹砂率都单调递增,且夹砂率在低角度(30°~60°)比在高角度(60°~90°)增加的速率更高。喷枪移动速度从1 mm/s增至20 mm/s,粗糙度呈现先减少后增加再减少的趋势;夹砂率呈现先增加后减少的趋势。对于粗糙度,线性回归模型的预测误差率为5.97%,多项式回归模型的预测误差率为5.15%;对于夹砂率,线性回归模型的预测误差率为5.76%,多项式回归模型的预测误差率为3.08%。结论基于现有的数据,采用多项式和线性2种回归模型进行预测,多项式回归模型的预测精度比线性回归模型更高。结合现有的数据和多项式回归模型的预测数据得出了最佳工艺范围,喷砂压力为0.2~0.3 MPa,喷砂角度为45°~60°,喷枪移动速度为15~20 mm/s。在该条件下,得到了较高的粗糙度和较低的夹砂率,有利于获得高的涂层/基材界面结合强度。The work aims to establish a high-precision model of the multivariate sandblasting process for Mar M247 Ni-based superalloy used as gas turbine blade and used it to design the process combination that can realize surface quality of high roughness and low fraction of retained grit.The sandblasting specimens were prepared by an automated precision controlled sandblasting system made in China and then the surface quality was examined by roughness detector and scanning electron microscopy and the relationship between the sandblasting processing and the surface quality was established based on the mathematical statistics theory.With the sandblasting angle increasing from 30°to 90°,both the roughness and fraction of retained grit increased and the increasing trend was more pronounced at low angle range(30°-60°)as compared to that at high angle range(60°-90°).With the pressure of 0.3 MPa and the sandblasting gun moving velocity of 5 mm/s as example,as the sandblasting angle increased from 30°to 90°,the fraction of retained grit increased from 12.84%to 24.31%,the average size of retained grit increased from(32.10±0.47)μm to(60.77±0.50)μm,and the roughness increased from(5.88±0.48)μm to(7.80±0.41)μm.With sandblasting gun moving velocity increasing from 1 mm/s to 20 mm/s,the fraction of retained grit showed a trend of firstly increasing and then decreasing.In contrast,the roughness decreased firstly at low gun moving velocity,then increased with further increase in gun moving velocity,and again decreased at high gun moving velocity.With the pressure of 0.3 MPa and the sandblasting angle of 60°as an example,as the sandblasting gun moving velocity increased from 1 mm/s to 20 mm/s,the fraction of retained grit firstly increased from 20.70%to 23.54%,and then decreased to 21.94%,the average size of retained grit increased from(51.75±0.26)μm to(58.85±0.45)μm and then decreased to(54.85±36)μm.In the meantime,the roughness firstly increased from(7.55±0.24)μm to(9.11±0.52)μm and then decreased to(8.72±0.

关 键 词：镍基高温合金 喷砂工艺 表面质量 数理统计 回归分析 工艺预测 

分 类 号：TG174[金属学及工艺—金属表面处理]