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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第7期    总第287期    2018年7月

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文章编号:1672-7207(2018)07-1634-09
不同热处理材料在超细Al2O3颗粒作用下的冲蚀试验研究
刘子武,李剑峰,李方义,贾秀杰

(山东大学 机械工程学院高效洁净机械制造教育部重点实验室,山东 济南,250061)

摘 要: 利用高速冲蚀试验系统,选用超细Al2O3颗粒作为冲蚀颗粒,研究3种叶片材料不同热处理方式下的冲蚀行为。通过探讨材料冲蚀率、表面粗糙度、表面硬度等随冲蚀角度变化的规律,分析冲蚀特性曲线的异同,解释显微组织结构对冲蚀机理的影响。研究结果表明:3种材料冲蚀率都有1个最高点,材料塑性越好,冲蚀率最高点向低角度方向移动;在低角度冲蚀时,材料以微切削方式被去除,组织越硬抗冲蚀能力越强,其中回火索氏体组织中大尺寸碳化物能够直接起到抗冲蚀作用;在较高角度冲蚀时,材料表面首先发生塑性变形,偏向堆积沟槽末端,后续的粒子将这部分材料切除或者剪切折断去除;接近正向冲蚀时,材料经反复变形后,硬化剥落或剪切折断去除;表面粗糙度随冲蚀角度变化呈先增加后降低的趋势,且中高角度冲蚀的表面质量较差;塑性越好的材料冲蚀硬化越明显,正向冲蚀下的硬化程度最高。

 

关键词: 冲蚀磨损;热处理;显微组织;冲蚀机理;粗糙度;冲蚀硬化

Experimental study on erosion of materials with different heat treatment by ultrafine Al2O3 particles impacting
LIU Ziwu, LI Jianfeng, LI Fangyi, JIA Xiujie

School of Mechanical Engineering & Key Laboratory of High Efficiency and Clean Mechanical Manufacture,Shandong University, Jinan 250061, China

Abstract:The erosion behaviors of three materials under different heat-treatment conditions impacted by ultrafine Al2O3 particles on the erosion test equipment were studied. The variation laws of erosion rates, surface roughness, erosion hardening with impacting-angles were studied systematically. Differences and similarities among the characteristic curve of erosion were analyzed and the effect of microscopic structures on erosion mechanism was also explained. The results show that there is the peak value for three plastic materials, and with increasing the plasticity, the erosion peak will move towards the low angles. At low impact angles, the erosion is dominated by micro-cutting, and the harder the microscopic structure of material is, the stronger erosion-resisting becomes. Therein, large size carbides in the tempered sorbite will play an important role in anti-erosion directly. At higher impact angle, deformation dominates the erosion surface, and materials bias stack the end of the grooves, which will be cut down or broken off by subsequent particles. Close to the positive erosion, materials will be hardened and peeled off after repeated deformation. The surface roughness increases initially and then decreases, and the surface has poor quality at the middle impact angle. The better the ductility of material is, the stronger the erosion hardening becomes, and the degree of erosion hardening is the highest at the impact angle of 90°.

 

Key words: erosion; thermal treatment; microstructure; erosion mechanism; roughness; erosion hardening

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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