Effect of interaction between cementite and pearlite on two-body abrasive wear behaviors in white cast iron
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ISSN 2223-7690 CN 10-1237/TH
RESEARCH ARTICLE
Effect of interaction between cementite and pearlite on two-body abrasive wear behaviors in white cast iron Baochao ZHENG1,*, Wei LI1, Xiaohui TU1, Jiandong XING2, Suocheng SONG2 1
Institute of Advanced Wear & Corrosion Resistant and Functional Materials, Jinan University, Guangzhou 510632, China
2
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Received: 05 March 2020 / Revised: 11 May 2020 / Accepted: 05 June 2020
© The author(s) 2020. Abstract: The wear interaction of cementite and pearlite in the white cast iron (WCI) was investigated using the two-body abrasive wear test under contact loads of 20, 35, and 50 N. The wear behavior, wear surface morphology, sub-surface structure, and wear resistance were evaluated using X-ray diffraction, microhardness testing, and nano-indentation. The results indicated that when the Cr content was increased from 0 to 4 wt%, there was a significant increase in the microhardness (H) and elasticity modulus (E) of the cementite. This yielded a 15.91%- and 23.6%-reduction in the degree of wear resistance and surface roughness, respectively. Moreover, no spalling and breaking of cementite was observed with increasing Cr content during the wear process, indicating improved wear resistance of the bulk cementite. In addition, the hard phase (cementite) and tough matrix (pearlite) composite structure exhibited a good protective and supporting effect. Thus, it was concluded that the interaction mechanism of the wear phase contributed to the reduction of the wear weight loss of the composite during the wear process. The contribution of the interaction between the hard wear-resistant phase and the tough phase in WCI to the wear resistance decreased with increasing hardness of the pearlite matrix. Keywords: two-body abrasive wear; white cast iron (WCI); wear resistance; interaction
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Introduction
As wear-resistant materials, chromium white cast iron (WCI), boron WCI, and particle reinforced metal matrix composite consist of a tough metalbased phase (e.g., austenite, martensite, ferrite, and pearlite) and a hard wear-resistant phase (e.g., carbide, ceramic hard-phase). These materials are extensively used in various industrial fields, such as mining grinding, mineral handling, and oil sand slurry pumping [1–4]. Generally, the wear resistance of WCIs depends on the hard carbides and metal matrix composite structure, both of which play an important role in the resistance to abrasive wear.
Carbides resist the wear process by protecting the metal matrix from further cutting during the wear process; on the other hand, the toughness of the metal matrix (e.g., pearlite matrix, martensite matrix, and steel/iron) provides support to the worn carbide leading to plastic compensation for the carbide during the wear process. The combined protective and supporting effect leads to the reduction in the wear weight loss of the composite; this effect is
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