本文研究了硼对Fe-H42Ni-12Cr-4W-1.5Mo-4.5Ti-2Al合金热强性的影响,结果表明:硼在合金中以固溶及二次硼化物状态存在可以提高合金的持久性能;而以一次硼化物存在对合金的持久强度并无贡献,过多的一次硼化物还会引起持久性能降低。 试验结果还表明,该合金固溶温度升高引起的持久性能提高,是由于晶界二次硼化物浓度增加所引起的。在试验的晶粒度范围内,单纯的晶粒长大并不能引起持久性能的提高。
The effect of boron on the high temperature strength of an Fe-42Ni-12Cr-4W-1. 5Mo-4.5Ti-2Al alloy has been investigated. The results indicate that the boron either soluted in solid solution or precipitated as a secondary boride phase along the grain boundaries will improve the stress rupture properties of the alloy. But the primary borides can not better it at all, moreover, it may deteriorate the high temperature strength of alloy if an overabandant primary boride occurred. It was also found that the stress rupture properties of alloy have much improved since it solution treated under elevated temperature, this seems to attribute the improvement to the increase of the amount of secondary boride precipitation at unit interface area after solutioning and aging, not to the grain growth alone from higher solution temperatures in the tested range of grain size.
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