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Hadfield steel is well known for its high work hardening capacity and wear resistance. The alloy X120Mn12 is specifically used in railroad castings such as frogs and crossings in west European countries such as France. The influence of various contact parameters on the mechanical behaviour of this alloy was investigated by rolling contact tests. The results are described and discussed using micro-hardness...
This paper analyses friction coefficient evolution of dry lubricant coatings subjected to unidirectional sliding. Dry lubricant coatings have been investigated for maintaining low friction under sliding conditions, and have been used for this purpose in mechanical components. Experimental characterisation of coating durability can be achieved by measuring the friction coefficient as a function of...
This paper focuses on the simulation of low cycle fatigue (LCF) failures in highly loaded coated surfaces subjected to mixed rolling–sliding contact in dry conditions. The development of an advanced finite element (FE) model and creation of a unique user-defined subroutine are used to predict subsurface crack initiation in multilayer surfaces. Through the application of shakedown principles and the...
The wear properties of A390 (Al–17Si–4.5Cu–0.5Mg, wt%) hypereutectic Al–Si alloy were compared to new alloys containing 6 and 10wt% Mg. The wear behaviour was investigated using dry sand rubber wheel (DSRW) abrasive wear apparatus for these alloys in the as-cast condition and after T6 heat treatment. A transformation of hard and coarse primary Si particles to fine Mg 2 Si particles with inferior...
In the present investigation, the wear resistance of tools for the precision stamping of a mechanical part for the automotive industry is optimised. The investigation is divided into two stages. In the first one, the progression of damage in the punches and dies is assessed. Wear mechanisms are evaluated by means of observations and measurements in a scanning electron microscope (SEM). In the second...
The high temperature wear performance of Inconel 617 and Stellite 6 alloys was investigated and compared with that of the X32CrMoV33 hot work tool steel. The wear performance of the latter at 750°C is judged to be very poor due basically to its inferior oxidation resistance. Extensive oxidation co-occurring with wear at 750°C leads to substantial material loss basically due to the lack of an adhesive...
This paper presents a model for the contact mechanics of tread blocks on a free-rolling pneumatic tyre, of a complexity intermediate between sophisticated 3D finite element (FE) analyses and simple brush models. The model is able to capture the essential physics of the contact while being sufficiently simple to be incorporated into dynamic tyre models, such as can be used to predict hub forces. The...
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