喷砂工艺对CB2铁素体耐热钢表面粗糙度和夹砂率的影响  

Effect of Sandblasting Process on Surface Roughness and the Fraction of Grit Residue of CB2 Heat Resistant Stainless Steel

作　　者：王云普 袁小虎[2,3] 李定骏 唐春梅[2] 袁卫锋 赖建平[1] 余家欣 Wang Yunpu;Yuan Xiaohu;Li Dingjun;Tang Chunmei;Yuan Weifeng;Lai Jianping;Yu Jiaxin(School of Manufacturing Science and Engineering,Southwest University of science and Technology,Mianyan 621000;State Key Laboratory of Long-Life High Temperature Materials,Dongfang Electric CorporationDongfang Turbing Co.,Ltd.,Deyang 618000;School of Materials Science and Engineering,Chongqing University,Chongqing 400044)

机构地区：[1]西南科技大学制造科学与工程学院,绵阳621000 [2]东方电气集团东方汽轮机有限公司长寿命高温材料国家重点实验室,德阳618000 [3]重庆大学材料科学与工程学院,重庆400044

出　　处：《热喷涂技术》2022年第4期35-41,共7页Thermal Spray Technology

基　　金：国家科技重大专项(2019-Ⅶ-0007-0147);国家自然科学基金(51975492);西南科技大学自然科学基金(19xz7163;12072300);国家重点研发计划项目(2020YFB2010402)。

摘　　要：为了研究喷枪位移方向和喷砂角度对喷砂质量(表面粗糙度、夹砂率)的影响规律,使用自动喷砂设备处理试样,采用粗糙度仪、激光显微镜、扫描电镜(SEM)分别表征喷砂试样表面粗糙度、微观形貌和夹砂率。应用裂纹扩展理论和微切削理论系统地分析了表面粗糙度和夹砂率变化的机理。在喷砂距离为200 mm、喷砂压力为0.3 MPa、磨料流量为3 kg/min、喷枪位移速度为0.8 m/s的条件下,喷砂角度为15°时表面粗糙度值和夹砂率最小,喷枪垂直走向表面粗糙度为8μm夹砂率为11.28%,水平走向表面粗糙度为5.7μm夹砂率为15.68%;喷砂角度为75°时表面粗糙度最大,垂直走向粗糙度为11.12μm,水平走向粗糙度为10.13μm;喷砂角度为90°时夹砂率最大,垂直走向夹砂率为25.56%,水平走向夹砂率为25.33%。结论表明,表面粗糙度随喷砂角度增加先增加后减小,在75°时最大;夹砂率随喷砂角度增加递增,在90°时最大。喷枪垂直走向下的表面粗糙度大于水平走向下的表面粗糙度;喷枪水平走向下的夹砂率大于垂直走向下的夹砂率。The work aims to study the effects of blast gun moving direction and sandblasting angle on surface roughness and the fraction of embedded grit.The samples were processed by automatic sandblasting equipment and then characterized by scanning electron microscope(SEM),laser microscope and surface toughness tester to quantify the surface roughness and the fraction of embedded grit retained in the steel matrix.Crack propagation theory and micro-cutting theory were used to analyze the processing factors including blast gun's moving direction and sandblasting angle in affecting surface roughness and the fraction of embedded grit.Under the conditions of standoff distance of 200 mm,sandblasting pressure of 0.3 MPa,blast media feed rate of 3 kg/min and displacement speed of blast gun of 0.8m/s,the surface roughness value and the fraction of embedded grit were the smallest when the sandblasting angle was 15°.At this time,the fraction embedded grit and surface roughness were determined to be 11.28%and 8μm respectively for the vertical direction,15.68%and 5.7μm for the horizontal direction.As the sandblasting angle increases,the surface roughness reaches the maximum at 75°,with value being 11.12μm and 10.13μm for the vertical and horizontal directions respectively.While the faction of embedded grit reaches the maximum at 90°,with the vertical one being 25.56%and horizontal one being 25.33%.To sum up,with increasing the sandblasting angle,the surface roughness increases first and reaches the maximum at 75°,then followed by a slight decrease,while the area fraction of embedded grit increases monotonously and eventually reaches the maximum at 90°.Compared to the horizontal direction,the vertical direction always exhibits a larger surface roughness but a lower fraction of embedded grits for a given blasting angle.

关 键 词：喷砂预处理 喷砂角度 喷枪走向 粗糙度 夹砂率 

分 类 号：TG174.4[金属学及工艺—金属表面处理]