应用两种热处理制度分别获得弯曲晶界和平直晶界,研究两种晶界状态对10Cr-15Co-Ni基变形高温合金蠕变断裂过程的影响,重点探讨弯曲晶界改善合金热强性原因。研究表明,弯曲晶界对裂纹的萌生、长大及扩展,对裂纹的形态及断裂方式,都有显著的影响。弯曲晶界能有力地阻止晶界滑动及推迟裂纹连接,使晶内参与更多的变形,弯晶的主要作用体现在蠕变第三阶段。合金经弯晶处理后蠕变断裂寿命提高26％。
Investigation was made of the effect of the zigzag or straight grain boundary, which may be obtained by two different schemes of heat treatment, on the creep rupture of a 10Cr-15Co-Ni-base wrought superalloy, especially, on the reason whyits strength and plasticity at elevated temperature can be improved by the zigzaggrain boundary. It is shown that the zigzag grain boundary may delay the initiation, growth and propagation of crack, as well as may also influence the crack morphology and the fracture mode markedly. Furthermore, the zigzag grain boundary may intensively inhibit the grain boundary sliding and retard the crack joining, thus, force the bulk-grains to take part in more deformation. It displays an important role in the tertiary stage of creep. The creep life to failure of the alloy tested with zigzag grain boundary was increased by a factor of 1/4, and the plasticity was also improved slightly.
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