研究了热处理对新研制的定向凝固钴基高温合金DZ40M组织和性能的影响。结果表明：1280℃/4h固溶处理可完全溶解DZ40M合金中初生碳化物M7C3和MC，合金成为单相固溶体。950℃和1050℃时效处理可使DZ40M合金发生硬化，以950℃时效硬化效果更为明显，相应的峰时效制度为950℃/12h和1050℃/24h。时效处理引起M23C6沉淀析出。950℃/12h时效显著提高DZ40M合金室温强度和高温持久寿命，同时也减少了合金塑性，但合金仍保持一定的塑性。1050℃/24h虽然能增加室温拉伸性能，但削弱了高温持久性能。
DZ40M alloy is a newly developed directionally solidified cobalt-base superalloy. The present work investigated the effect of heat treatment on microstructures and mechanical properties of DZ40M alloy. The results showed that solution treatment at 1280℃ for 4h could dissolve the primary carbides M7C3 and MC essentially and the alloy became a single phase solid solution. Aging treatments at both 950℃ and 1050℃ could harden the alloy and 950℃ aging caused a more effective hardening. Two peak aging treatments were determined as 950℃/12h and 1050℃/24h. Aging treatments resulted in secondary M23C6 precipitation. 950℃/ 12h treatment increased room-temperature strength and stress-rupture life at high temperature substantially and reduced ductility. However, in spite of it, the alloy still has adequate ductility. Although it increased room-temperature mechanical properties, 1050℃/ 24h treatment deteriorated stress-rupture properties at high temperature.
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