低脆性FeCrAlY合金的研制

Dvelopment of Lower Brittle FeCrAlY Alloy

Ｆｅ－１５Ｃｒ－４Ａｌ－Ｙ合金克服了ＦｅＣｒＡｌ合金的高温脆化和４７５℃脆性，热强性和冷加工性也明显改善，ＦｅＣｒＡｌ使用温度高，抗氧化性好等优点则得到保留。还研制了使用温度更高的Ｆｅ－２０Ｃｒ－４Ａｌ－Ｙ，Ｆｅ－２５Ｃｒ－４Ａｌ－Ｙ合金，形成了低脆性合金系列。加入强化元素能进一步提高合金的热强性．用轻稀土元素代替Ｙ则能降低生产成本。该低脆性合金系列可用于电热、电阻元件、耐热结构件和耐高温涂层．用它代替Ｎｉ－Ｃｒ系合金可降低元件成本，提高其使用温度和服役寿命．

Compared with FeCrAl alloy, Fed15Cr-4Al-Y alloy has lower brittleness (at high temperature and 475 ℃ ),higher heat-resisting strength and better machinability,with the high operating temperature and good anti-oxidation of FeCrAI being retained. Pe-20Cr-4Al-Y and Fe-25Cr-4Al-Y alloy with higher operating temperature have been developed, so that low brittle alloy series have been set. Addition of strengthening elements can further improve heat-resisting strength; while light rare-earth elements can reduce the production cost instead Of Y. The alloy series can be used in electroheating, resistance element, heat-resisting components and high temperatare coat. It can reduce cost and improve operating temperature and service life instead of Ni-Cr alloy series.