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前言 GH18铁基时效合金板材是根据我国自然资源的特点,自行研制的高温合金板材,合金中含有～2%钨,～4%钼,用以强化固溶体基体,同时还加入了～0.5%铝,～2%钛,用作沉淀强化元素,并加入硼、铈、锆等元素来净化以及强化晶界。合金中不含有我国稀缺的元素钴。 由于采用时效强化的结果,GH18合金在高温下具有比固溶强化板材合金高得多的强度。 在某涡喷发动机的研制过程中,起先曾采用固溶强化的GH30镍基高温合金板材来做燃烧室的前进气锥,由于GH30合金在该发动机工作温度下的高温强度不够,前进气锥在试车过程中产生严重变形,影响发动机正常运转,使试车多次失敗。
Preface GH18 iron-based aging alloy sheet is a high-temperature alloy sheet developed by our country based on the characteristics of natural resources in our country. The alloy contains ~ 2% tungsten and ~ 4% molybdenum to strengthen the solid solution matrix and also add ~ 0.5% ~ 2% titanium, used as precipitation strengthening elements, and added boron, cerium, zirconium and other elements to purify and strengthen grain boundaries. Alloy does not contain China’s scarce elements of cobalt. Due to aging-enhanced results, the GH18 alloy has a much higher strength at elevated temperatures than the solution-strengthened sheet metal. In a turbojet engine development process, initially used solid solution strengthened GH30 nickel base superalloy plate to do the combustion chamber forward gas cone, GH30 alloy at the engine temperature high temperature strength is not enough, the forward gas Cone in the test process has serious deformation, affecting the normal operation of the engine, the test failed many times.