经脆化动力学、内耗、TEM和Mossbauer谱等研究表明:Fe-15Cr-4Al和Fe-25Cr-SAl合金的475℃脆化包括两种过程.碳化物在晶界析出损害界面结合,降低断裂应力,使塑性在时效0.25h后消失.时效温度从400提高到600℃时,发生过时效的时间从>1000h缩短到约1h.从α相均匀析出的富铬α'相通过强化基体引起二次脆化.它与时效温度的关系有“C曲线”的特征,作用仅在440—475℃较明显.Y-Fe相质点俘获α相中的碳原子,消除时效过程的碳化物析出.钇也延缓α'相发展.这两种作用使含钇合金的时效脆化受到强烈抑制.
475℃ embrittling kinetics and relevant microstructure changes were investigated by internal friction, TEM, Mossbauer spectra. The results showed that the embrittling in Fe-15Cr-4Al and Fe-25Cr-5Al alloys was caused by two processes. In the first age stage
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