分析了定向凝固镍基高温合金DZ17G在广泛应力范围(105～950 MPa)内的高温(650～980℃)持久实验数据.结果表明,在同一温度下,合金的持久寿命与施加应力间的关系符合半对数规律, 可以利用Manson-Succop系数法对短期实验数据进行外推,以预测长期持久寿命.给出了DZ17G合金的持久方程及热强参数综合方程,预测值与实测值很好符合.
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