通过力学性能测试及OM、SEM、TEM的观察,初步研究了钽对Fe-C-Ta合金的强化作用及相关机制.研究结果表明,钽含量从0.027％增加到0.059％(质量分数,下同)时,合金的强度大幅度提高,高钽含量合金的冲击功降低87J,但仍然具有较好的韧性.分析认为,钽在铁基合金中的强化作用表现为固溶强化和析出强化,高钽含量合金(0.059％)在600℃时效1h后,其强度和塑性同时达到最大值,获得了最佳的含钽碳化物的析出强化效果.
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