Fe-15Cr-4Al和Fe-20Cr-4Al合金在处理温度高于1000℃时发生高温脆化,冷却过程产生的475℃脆性是脆化的重要原因。预处理温度超过1000℃的试样在500℃二次处理时475℃脆性发展极快,15min后塑性消失,含0.2—0.4wt-％Y的合金在800—1300℃加热后塑性不降低,在500℃也不产生475℃脆性。
A high temperature embrittlement occures in Fe-15Cr-4Al and Fe-20Cr-41Al alloys treated over 1000℃. It is caused mainly by 475℃ brittleness during cooling. When a secondary treatment at 500℃ was conducted, the 475℃ brittleness developed very rapidly. After only 15 min of the treating, little plasticity was remained for all samples pretreated at the temperatures over 1000℃ and cooled in water. However, no 475℃ brittleness was generated when pretreating temperature was below 1000℃ . Addition of Yttrium can inhibit not only grain growth, but also 475℃ brittleness. For the alloys with 0.2 —0.4wt-%Y, after treating at 800—1300℃, the plasticity did not decrease and the properties of furnace cooled samples were not lower than those of water cooled samples.
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