Abstract:With increasing thrust-weight ratio and inlet temperature of turbine for the aircraft engine,higher comprehensive performance requirements are put forward for components operating in hot environment manufactured by premium Ni-based superalloy. The quality of high temperature alloy material depends on its chemical composition and structure. It is obligatory to strictly control the alloy composition and reduce the content of harmful elements firstly. Since the residual detrimental impurities such as Pb,Sn,As,Sb,Bi,Se,and O,N,S etc are difficult to remove through common refining technology in practice, the purity of superalloy products would greatly depends on purity of raw materials used in production. Along with improvement in equipment and technology of domestic alloy making enterprises,raw materials of high harmful impurity content has become the bottleneck,limiting stable production of premium Ni-based superalloy. Based on the analysis of sources of trace elements in primary raw materials used in production of superalloy,the approaches of quality control for raw materials are proposed including selecting superior ore resources,improving the level of extraction and refining,purifying scrap and spent alloy component and cleaning the raw materials before charging.
收稿日期: 2017-04-12
出版日期: 2017-09-07
引用本文:
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