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在金属基体中加入第二相氧化物一般都能大大提高高温强度.许多工作者已对于Al,Mo,Cr,Ni-Cr,Mg,Co,Fe和奥氏体钢等材料作出了一些结果.这些结果都表明在金属基体中加入氧化物是一种提高耐热性的较好途径.我们用晶界腐蚀法将ЭИ257耐热钢制成粉末,再用粉末冶金方法将这种钢粉掺混少量氧化物粉末作成试样,在室温至900℃间进行不同温度的硬度测量。结果表明,以达到同一热硬度为标准,含氧化物的試样比不含氧化物的其温度可提高250℃左右.又将上述试样形变50%后经过不同温度的退火处理,测量处理后的室温硬度,结果也表明氧化物的加入可以阻止形变基体的回复和延缓再结晶的进行.
The addition of a second phase oxide to a metal matrix generally results in a significant increase in high temperature strength.Many workers have made some results with materials such as Al, Mo, Cr, Ni-Cr, Mg, Co, Fe and austenitic steels. These results show that the addition of oxides in the metal matrix is a good way to improve the heat resistance.We use the grain boundary corrosion method ЭИ257 heat-resistant steel powder, and then powder metallurgy method of this steel powder blending A small amount of oxide powder as a sample, at room temperature to 900 ℃ hardness measurements at different temperatures. The results show that with the same hot hardness as the standard, the temperature of oxide-containing samples can be increased by about 250 ℃ than that of oxide-free samples, and after the above samples are deformed by 50%, annealed at different temperatures, Room temperature hardness, the results also show that the addition of oxides can prevent the deformation of the matrix recovery and delay the conduct of recrystallization.