Effect of titanium addition on structure and properties of the as-cast high Cr–Mo white iron
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Khaled M. Ibrahim
Abstract
This work analyses the wear behaviour and impact toughness of high Cr –Mo white irons alloyed with titanium as related to their microstructure and solidification path. Five alloys were used with different percentages of titanium (0, 0.47, 0.932, 1.31 and 1.78 %). Such additions of titanium resulted in precipitation of small hard TiC particles in the austenitic matrix. These particles were well distributed in the matrix with Ti-additions up to 1.31% and then started to agglomerate with 1.78%Ti. Hardness increased dramatically with increasing amount of titanium addition. The wear behaviour was investigated for each alloy in the as-cast condition using the pin-on-ring configuration for 30 min against a ring made of SiC that rotated at a constant speed of 65 rpm. The wear test was performed under a load range of 30–180 N. The results are discussed in terms of microstructure and the minimum wear rate was obtained for the white cast iron alloyed with 1.31% titanium. The optimum tensile strength, impact toughness and wear resistance were also observed for the iron alloyed with 1.31% titanium. However, these properties started to deteriorate with further increase in titanium addition due to the clustering effect of titanium carbide particles in the austenitic matrix. Therefore, the optimum wear resistance and impact toughness of white cast iron under investigation (16% Cr-1.3% Mo-2.3% Ni) can be achieved by adding 1.31% titanium.
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© 2012, Carl Hanser Verlag, München
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Articles in the same Issue
- Contents
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- Original Contributions
- Free-surface enhanced continuum model predicts size-effect for pillar compression at micro- and nano-scale
- Modelling of microstructural evolution on complex paths of large plastic deformation
- Melting temperature of metallic nanoparticles embedded in a rigid matrix
- On the coupled growth of oxide phases during internal oxidation of Ag–Sn–Bi alloys
- Phase diagram of the Sb–Te–I system and thermodynamic properties of SbTeI
- Pressureless co-sintering behaviour of a steel/cemented carbide component: model bimaterial
- Rafting structure formation during solution treatment in a nickel-based superalloy
- A model to calculate the viscosity of silicate melts
- Prediction of glass transition temperatures of aromatic heterocyclic polymers
- Relationship between the γ and some parameters of Fe-based bulk metallic glasses
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- Effect of welding sequence on residual stress distributions in GTA welding of AA5251 plate
- Electrochemical machining of Al/15% SiCP composites through a response surface methodology-based approach
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