Abstract The nucleation of the Laves phase particles in a Re-containing 10% wt. Cr-3% Co-3% W steel with a low nitrogen and a high boron contents during creep is characterized by distinctive features. The precipitation process can be written as M23C6 carbide → M6C carbide → Laves phase. The nucleation of all phases in this precipitation sequence is heterogeneous. The M23C6 carbides precipitate on the boundaries of martensitic structure during tempering at temperature of 770 °C. The M6C (Fe3W3C) carbides precipitate during both tempering at 770 °C and creep at 650 °C on the M23C6/ferrite surfaces and on the martensitic lath boundaries. The M6C carbides have the mutual relationship of crystal orientations with both the M23C6 carbides and ferrite. The chemical composition of the M6C carbides depends on their nucleation sites. After 83 h of creep, the M6C carbides starts to dissolve, whereas the Laves phase particles are nucleated on the M6C/ferrite surface and separately on the martensitic lath boundaries. The Laves phase particles nucleate on the M6C/ferrite surface are smaller than those nucleated on the martensitic lath boundaries. The Laves phase particles exhibit the unique orientation relationships with a high misfit. The transformation of M23C6 → M6C → Laves phase is an in-situ transformation accompanied by chemical compositional changes.

中文翻译：

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含 Re 10% Cr 钢在 650 °C 蠕变过程中富 W 碳化物和 Laves 相的形核

摘要 Laves 相粒子在含 10% wt 的 Re 中成核。Cr-3% Co-3% W 钢在蠕变过程中具有低氮和高硼含量，具有鲜明的特点。析出过程可写为 M23C6 碳化物 → M6C 碳化物 → Laves 相。该沉淀序列中所有相的成核是不均匀的。M23C6 碳化物在 770 °C 回火过程中在马氏体组织的边界上析出。M6C (Fe3W3C) 碳化物在 770 °C 回火和 650 °C 蠕变期间在 M23C6/铁素体表面和马氏体板条边界上析出。M6C碳化物与M23C6碳化物和铁素体都具有晶体取向的相互关系。M6C 碳化物的化学成分取决于它们的成核位置。蠕变 83 小时后，M6C 碳化物开始溶解，而 Laves 相颗粒在 M6C/铁素体表面和马氏体板条边界上分别成核。在 M6C/铁素体表面成核的 Laves 相颗粒比在马氏体板条边界上成核的颗粒小。Laves 相粒子表现出独特的取向关系，具有高失配。M23C6 → M6C → Laves 相的转变是一种伴随化学成分变化的原位转变。Laves 相粒子表现出独特的取向关系，具有高失配。M23C6 → M6C → Laves 相的转变是一种伴随化学成分变化的原位转变。Laves 相粒子表现出独特的取向关系，具有高失配。M23C6 → M6C → Laves 相的转变是一种伴随化学成分变化的原位转变。