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Wear
Elsevier
Wear

Elsevier

0043-1648

Wear/Journal WearSCIISTPEIAHCI
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    Effect of the third body layer formed at different temperature on fretting wear behavior of 316 stainless steel in the composite fretting motion of slip and impact

    Zhang S.Liu L.Ma X.Zhu G....
    9页
    查看更多>>摘要：316 SS is a commonly used material for steam generator tube. The object of this investigation is to study the influence of temperature, which is 95 °C and 250 °C, on the formation of the third body layer (TBL), and the role of TBL on the fretting wear behavior of 316 SS. Thus, the fretting wear experiment between 316 SS tube and 316 SS plate was carried out in the composite fretting motion of slip and impact in pure water environment. The experiment time was set as 24 h, 48 h, 72 h and 120 h. The results show that at 95 °C, TBL is hard and attaches closely to the surface, which can lead to uniform abrasion and result severe microploughing between the base materials. While at 250 °C, the existence of thick TBL can avoid direct contact between base materials, and it can be easily deformed by shear forces due to its ductility, which acts as a lubricant and reducing volume loss and wear coefficient. Finally, we can conclude that temperature affects the formation mechanism and properties of TBL, thus changing the fretting wear behavior.
      原文链接:
    • NSTL
    • Elsevier

    Benefits of passive element Ti to the resistance of AlCrFeCoNi high-entropy alloy to corrosion and corrosive wear

    Wu M.Setiawan R.C.Li D.Y.
    17页
    查看更多>>摘要：Wear behaviors of 5-element AlCrFeCoNi and 6-element AlCrFeCoNiTi0.5 high entropy alloys (HEAs) against the Si3N4 ball respectively in 3.5 wt% NaCl and HCl (pH = 3) solutions were investigated. The role of the Ti addition in affecting microstructure, hardness, wear and corrosion of the HEA was analyzed. Results showed that the AlCrFeCoNiTi0.5 exhibited higher hardness, ascribed to the solid solution strengthening and precipitation strengthening. The wear loss of AlCrFeCoNiTi0.5 is markedly lower than that of AlCrFeCoNi under the dry condition against Si3N4 balls of 4 mm and 6 mm in diameter, respectively. The Ti addition also improved the corrosion resistance, especially the pitting corrosion resistance, of the HEA, evidenced by lowered Icorr and Ipit and elevated Rp and Rct. This was attributed to the contribution of Ti in the formation of a more protective passive film, which impeded the point defect transport and passive film breakdown. The surface potential measured by means of atomic force microscopy (AFM) shows a smaller difference between adjacent domains in AlCrFeCoNiTi0.5, which should only result in weak local galvanic coupling. Thus, the Ti addition helps suppress the pitting attack to the HEA. The solutions and size of counterpart ball have large influences on the performance of AlCrFeCoNiTi0.5 during corrosive wear. Efforts are made to clarify the mechanism for the beneficial role of Ti addition in affecting the performance of the HEA during the destructive processes.
      原文链接:
    • NSTL
    • Elsevier

    Friction and wear characteristics of the nanolaminated ternary transition metal boride: Mn2AlB2

    Benamor A.Hadji Y.Chiker N.Haddad A....
    11页
    查看更多>>摘要：Herein, the wear and friction behavior, under unlubricated sliding in ambient air, of the MAB phase Mn2AlB2 is reported. Various sliding pairs (WC, Al2O3, Si3N4, and chromium-bearing steel 100Cr6) were used in a ball-on-disc apparatus at a normal load of 10 N and a sliding velocity of 20 cm/s. Raman spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to identify the wear mechanisms and tribo-oxidation products involved during the dry sliding contacts. Against WC, Al2O3, and Si3N4, the Mn2AlB2 exhibited wear by tribo-oxidation accompanied with delamination and abrasion, which led to high wear rates on the order of ～10-3 mm3/N · m and coefficients of friction of 0.72–0.87. However, Mn2AlB2/100Cr6 tribopair showed relatively mild wear behavior. The evolution of COF and wear rate for this tribopair, under different loads (5, 10, 15 N) and speeds (5, 25, 50 cm/s), showed the existence of load and speed thresholds (15 N at 25 cm/s and 10 N at 50 cm/s), beyond which an abrupt transition from mild to severe wear of Mn2AlB2 takes place. Below the thresholds, the Mn2AlB2 surfaces remain undamaged with the formation of a protective transfer layer, composed of a mixture of iron and manganese oxides. Above the thresholds, both friction and wear increase, and the Mn2AlB2 wears by microfracture and grain pullout.
      原文链接:
    • NSTL
    • Elsevier

    Comparison of the damage and microstructure evolution of eutectoid and hypereutectoid rail steels under a rolling-sliding contact

    Bai W.Zhou L.Han Z.Wang W....
    12页
    查看更多>>摘要：The wear and rolling contact fatigue (RCF) performance of eutectoid and hypereutectoid rail steels were studied. Subsequently, the microstructure evolutions of subsurface materials of these two rail steels after testing were comparatively investigated. The results indicated that, compared with the eutectoid rail, the hypereutectoid rail had lower wear loss, but longer RCF crack lengths. After the rolling-sliding testing, the original equiaxed and undeformed coarse grains of rails in the matrix were transformed into nano-grains rich in high angle grain boundaries (HAGBs). The microstructure evolution of rail steels under rolling-sliding contact could be explained by two mechanisms. Firstly, the initial deformation and the breaking of the lamellar structure of pearlite grains occurred through the movement of dislocations. Secondly, the formation of the nanostructure grains happened through continuous dynamic recrystallization (cDRX). Compared with the eutectoid rail, the hypereutectoid rail had finer interlamellar spacing and higher contents of low angle grain boundaries (LAGBs) in the matrix. After the rolling-sliding testing, the hypereutectoid rail had more severe LAGBs-to-HAGBs transitions and a more severe cDRX process than the eutectoid rail, which might be the reason for the longer RCF crack lengths it exhibited.
      原文链接:
    • NSTL
    • Elsevier

    Fabrication and wear property of NiCo coated ZrO2–Al2O3 ceramic particles reinforced high manganese steel-based composites

    Li S.Yoong Tok A.I.Shi J.Liu F....
    13页
    查看更多>>摘要：In this work, the nickel-cobalt layer was used as a medium to improve the interfacial bonding of ZrO2–Al2O3 particles (ZTAP) reinforced high manganese steel-based composites. The nickel-cobalt layers on the surface of ZTAP ceramics are prepared by electroless deposition in the sulfate solutions. The formation mechanism, morphology evolution and elemental composition of the NiCo coating were investigated by varying the plating temperature, plating time and sulfate concentration. The NiCo grain size increases, and the coating thickness increases and then decreases with CoSiO4 concentration. A dense and uniform nickel-cobalt coating could be obtained after plating with 25 g/L CoSiO4 at 80 °C for 10 h. NiCo coated ZTAP ceramics reinforced high manganese steel matrix composites were fabricated using non-pressure casting infiltration. The results showed that NiCo improves the bonding property of composites causing a tighter and cleaner interface compared with severe defects of cracks, delaminations and holes on the interface of composites without NiCo coating. The effects of NiCo coating on tribological properties of the composites were clarified by the three-body abrasive wear. The superior interfacial bonding of composites assisted with NiCo coating exhibited excellent abrasive wear resistance, which increases by 230%.
      原文链接:
    • NSTL
    • Elsevier

    Sub-surface microstructural investigation for establishing micro-mechanisms of wear in sliding of SiC and SiC-WC ceramics

    Sharma S.K.Kumar B.V.M.Gurnani L.Jangid M.K....
    9页
    查看更多>>摘要：Dual-beam FIB/FEG-SEM and TEM/HRTEM observations of sub-surfaces of SiC and SiC-50 wt% WC composite disks worn against SiC ball have provided important insights into the micro-mechanisms of material removal and the role of WC towards suppressing the same. Sub-surface analysis reveals the silicon oxide rich tribochemical layer just underneath the worn surfaces of monolithic SiC. Further below this tribochemical layer, dislocations and twins in SiC grains, as well as micro-cracks, are identified. Micro-cracks get extended up to ～2 μm depth below the layer, eventually leading to material removal in SiC ceramics. In case of the SiC-WC composite, neither is the tribochemical layer dominant, nor is twin/dislocation networks seen to extend beyond the SiC/WC interfaces. Overall, the present study highlights that WC particulate reinforcements in SiC-WC composite minimize the wear damage by suppressing oxidative wear and restricting the generation of micro-cracks, which otherwise form extensively due to stress build-up at the tips of dislocations or twins in SiC grains.
      原文链接:
    • NSTL
    • Elsevier

    Preparation and tribological behaviors of magnesium silicate hydroxide-MoS2 nanoparticles as lubricant additive

    Guan Z.Zhang P.Florian V.Wu Z....
    14页
    查看更多>>摘要：The tribological properties of lubricating oil during service life largely depend on the properties of lubricant additives. Herein, we present a hydrothermal synthesis of magnesium silicate hydroxide (MSH)-MoS2 nanocomposite and evaluate its tribological performances and repairing properties on worn surfaces as lubricant additive in poly-alpha-olefin (PAO). The microstructure of MSH-MoS2 powders is MSH nanotubes surrounded by layered MoS2. The tribological test results show that the anti-friction performance and wear resistance of the friction pair were improved by 27.7% and 37.4%, respectively, after adding 1.0 wt% MSH-MoS2 into PAO. More importantly, the worn volume of the friction disk can be repaired by 33.2% after sliding 5 h under the lubrication of PAO with MSH-MoS2. The superior tribological performance should be attributed to the formation of robust tribofilm with low shear strength, high hardness, strong resistance to plastic deformation, and high bonding strength on the sliding surface.
      原文链接:
    • NSTL
    • Elsevier

    Tribological performance of Al2O3–SiO2/PAG composite nanolubricants for application in air-conditioning compressor

    Zawawi N.N.M.Azmi W.H.Ghazali M.F.
    11页
    查看更多>>摘要：Proper lubrication using nanoparticles helps to reduce friction and wear in air-conditioning compressor. The improvement in tribological behaviour of composite nanolubricants contributes in reduction of the compressor work. Tribological behaviour, such as coefficient of friction (COF) and wear rate performance, were investigated for an automotive air-conditioning (AAC) system compressor using Al2O3–SiO2/PAG composite nanolubricants under reciprocating test conditions to simulate a piston ring or cylinder liner contact. Al2O3 and SiO2 nanoparticles were dispersed in the Polyalkylene Glycol (PAG 46) lubricant using two-steps method of preparation for 0.01%–0.10% volume concentrations. A tribology test rig was used to measure COF and wear rate performance at different loads (2–10 kg) and speeds (200–300 rpm). The highest COF and wear rates reduction of composite nanolubricants was attained up to 4.49% and 12.99% at 0.02% volume concentration, respectively. Meanwhile, the lowest COF and wear rates reduction of 0.01% and 0.26% is reported at 0.01% and 0.06% volume concentration, respectively. No reduction in COF and wear rates occurred for volume concentrations of more than 0.06%. Therefore, it is recommended to use the Al2O3–SiO2/PAG composite nanolubricants with 0.02% volume concentration for application in refrigeration systems.
      原文链接:
    • NSTL
    • Elsevier