Automobile Synchronizer Ring Hal62-4-3-0.1 Alloy And Performance

The HA162-4-3-0.1 brass alloy had been successfully prepared by means of vertical casting method. The deformation behavior of this alloy during compress process has been investigated with physical simulation techniques by upset tests of alloy samples, and the optimum heat treat conditions were determined by orthogonal method. Using an MHK-500 type tester measured their friction and wear properties under different conditions. The microstructure and surface micrograph were investigated by means of SEM, microprobe and TEM. The results are as follows:1. The true stress of hot deformation of alloy increases with the increase of the strain rate and the decrease of the temperature. At lower strain rates, the stress-strain curve is smooth, exhibiting no well defined yield stress, but at higher strain rate the true stress value reaches the apex rapidly at the initial stage, then decreased and converges to a steady level due to the soften effect. The constitutive equation for hot deformation of alloy is obtained on the basis of hyperbolic sine form model, and thematerial constants including activation energy, stress exponent and A, a, B arealso obtained.2. The microstructure of alloy shows that it consists of light-etching areas of a phase, which have a Widmanstatten morphology, a darker-etching matrix of B phase, and rod-shaped manganese silicide particles with a hexagonal cross-section. The microstructure and properties of as-cast alloy was improved by homogenizing at 750 ℃ for 6h, and the experimental alloy can get the best mechanical properties after quenching for 90min at 750℃ and aging for 60min at 300℃.3. The wear mechanisms of experimental material against GCrl5 steel under dry friction condition were systematically investigated, the wear resistance property of two other special brass alloys was compared with experimental alloy. As a result, experimental alloy have excellent wear resistibility. The main wear mechanism was adherence wear, and plastic deforming, fatigue fracture, and abrasive wear are also found in experimental alloy. By linear regression, the relation of friction coefficient, u , or wear rate, W, to load, P, can be described as W (oru )=a+bp+cp2+dp3.