Effect of alternate biomimetic coupling units on dry sliding wear resistance of gray cast iron
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Haifeng Zhang The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun 130025, People’s Republic of China; and The Department of Mechanical and Automotive Engineering, Changchun University, Changchun 130025, People’s Republic of China
Li Feng, Lin Yang, and Peng Zhanga),b) The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun 130025, People’s Republic of China (Received 22 September 2016; accepted 21 November 2016)
Wear resistance plays an important role to ensure the machining precision of machine tool using gray cast iron guide rail. Bio-inspired surfaces imitating the cuticle of desert scorpion and shell archetype with alternate units were prepared on gray cast iron using biomimetic coupling laser remelting in air and water. Samples consisting of striature bionic units with various distributions were examined under dry sliding condition using a home-made wear testing machine. It was found that samples with bionic units displayed better wear resistance than the untreated gray cast iron. While samples with bionic units processed in water by laser returned highest wear resistance in the short run, samples with alternatively distributed units (processed by laser) presented better wear resistance in the long run. However, to understand the stress distributions and the wear mechanism of the samples finite element method was used in this study. Based on the experimental evidences, a two-stage wear mechanism was proposed.
I. INTRODUCTION
Machine tool guideways are generally considered to be the integral parts of the table and bed castings.1 The wear of the components greatly governs the positioning of a machine system.2–5 Therefore, it is anticipated that machine tool precision can be improved through enhancing the tribological properties of guideways. Gray cast iron is commonly used in the machine tool guideways due to its low melting point, good damping property, low hardness, and low cost.6,7 However, the wear of gray cast iron in lubricated conditions has been observed frequently in many of its applications.8–10 Both theoretically and experimentally, laser processing has been used to improve the wear resistance of gray cast iron.11 In most of the previous studies, Pin-on-disk weartesting machine was used which exhibits some differences in guideway movement of bionic cast iron.12,13 However, there are few studies on linear reciprocating wear motion of gray cast iron. Therefore, it becomes Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] b) Permanent Address: No. 5988, Renmin street, Changchun 130025, People’s Republic of China. DOI: 10.1557/jmr.2016.474
imperative to analyze the wear characteristics of materials on a dry sliding wear. Thus a home-made linear reciprocating wear testing machine was designed and manufactured to achieve the linear reciprocating sliding wear. This form of wear resembles to wear occurred in practical application.13,14 Over billions years of natural selectio
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