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Special brass synchronizer ring of wear factors


+ Oxidation wear into the wear, it can greatly improve the wear life. 3.5 base material of strength and toughness has been shown [8 called ¨, when the wear is adhesive wear type, the matrix has an important effect on wear performance. Abrasion wear process close to the cracked matrix nucleation and growth mechanism,[link widoczny dla zalogowanych], so that the formation of wear debris is basically controlled by two processes: first, the formation of voids and cracks, and second crack. While maintaining adequate strength of the premise, should increase the toughness of the matrix, small, homogeneous matrix, high strength,[link widoczny dla zalogowanych], toughness, and can most effectively reduce the stress concentration to prevent crack propagation, thereby improving the wear resistance of materials. In this study, by adding rare earth elements (Ce master alloy of copper in the form of a join, which contains 0.1Ce) and trace element boron (B master alloy of copper in the form of a join,[link widoczny dla zalogowanych], which contains 0.1B), so that the copper alloy solution from the purification and metamorphism, effectively reduce the material in the inclusions, grain refinement, thus reducing the chance of crack formation and improve the crack propagation resistance; through a heat treatment solution, not only hard to adjust and refine the phase, is also toughening the matrix. Analysis showed (Fig. la ~ c), the matrix a, p-phase in alloy 2, the best morphology and distribution of materials, KD material, followed by alloy l poor. 4 Conclusion (1) Special brass synchronizer ring wear mechanism of the product is a serious adhesive wear, the key is to wear wear failure controlled type, that is when the main product is adhesive wear failure severe wear, and oxidation wear is adhesive wear + Compound wear, then wear less. (2) MnSi. Intermetallic compounds are of special brass synchronizer and the better the hard phase with high hardness, good stability, and the base material has a good combination. (3) in situ composite method through advanced technology, the hard phase and the short rod and wear and uniform vertical distribution of surface orientation in the material from the wear and support role. (4) by adding trace elements and rare earth master alloys to nickel and chromium distribution, and to products used in the hard surface to form a high and stable multi-oxides, the wear mechanism is mainly adhesive wear by the wear and tear to other types (such as oxidation wear) transformation. (5) Special brass synchronizer ring wear products, the best organization design are: ① the internal organization of the relative toughness and ductility in the matrix material on the distribution of good hard phase tissue; ② organizations should use surface the formation of high hard- diverse and stable oxide. References: [1] Sun Yangshan, Huang Haibo. Heat treatment on microstructure and properties of wear resistance of brass Ij]. Metal Heat Treatment, 1993,18 (1) :27-31. [2] Sun Jiashu. Metal wear rM]. Beijing: Metallurgical Industry Press, 1992. [3] Ren Shukun. China's auto transmission with synchronized ring situation and development trend of materials [J]. Automotive Technology, 1993, (1O) :44 - 46. [4] Huang Haibo, Sun Yangshan. Synchronizer ring material of I-j]. Automotive Engineering, 1995,17 (3); 187-192. [5] Li Yuan. High-strength wear-resistant aluminum bronze alloy and its tribological properties [J] _ China Nonferrous Metals, 1996,6 (3); 76 - 80. [6] RigneyD eight CommentsontheSlidingWearofMetals [J]. TribologyIntematicnal, 1997,30 (5) :361 - 367. [7] SundbergM, etc. MetallographieAspectsonWearofSpecialBrassEJ]. Wear ,1987,[link widoczny dla zalogowanych],21:151 - 156. [8] RidleyN. MicrostructureandWearofSomeHigh-TensibleBrassesEJ]. Mater. SCI, 1994,[link widoczny dla zalogowanych],29 (6) :1692 - 1699. [9] High Color Bridge. Friction Metallurgy [M]. Harbin: Harbin Institute of Technology Press, 1988. [1O] High Color Bridge. Friction Metallurgy [M]. Harbin: Harbin Institute of Technology Press, 1988. [11] KailasSV. AStudyoftheStrainRateMicrostruc-turalResponseandWearofMetalsI-j]. JournalofMaterialsEngineeringandPerformance, 2003,12 (6) 1629-637.

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