Alloying for impurity tolerance

点击翻译按钮获取中文摘要

The projected rise in the demand of high-quality steel could be met by recycling steel. However, steel scrap is often contaminated with pervasive metals and other impurities which cannot normally be completely extracted from melts. The concentrations of copper, phosphorus and sulphur are known to limit the applicability of recycled steels as they cause embrittlement, may exacerbate hot shortness leading to surface cracking and cause a reduction to properties like corrosion resistance, ductility and impact resistance. For this reason, there should be careful consideration of the levels of impurities in the alloys so that recycled steel alloys too can be used in more challenging and high-value applications. Alloying for impurity tolerance can be applied to different areas of power plants and the aim of this project is to test the suitability of designed alloys for application in simulated service conditions. By carrying out wear, corrosion resistance and fatigue tests, the effects of these impurities, heat treatment methods and coatings on the microstructural and mechanical properties of the designed alloys will be investigated.