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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Mechanical Properties of P91 Steel during Heat Treatment: The Effect of the Cooling Speed during the Normalization Stage
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Microstructure and Mechanical Properties of P91 Steel during Heat Treatment: The Effect of the Cooling Speed during the Normalization Stage

机译：热处理过程中P91钢的微观结构和力学性能：归一化阶段冷却速度的影响

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摘要

The evolution of the microstructure and mechanical properties of P91 steel during heat treatments at different cooling speeds during the normalization stage was investigated. Results showed that normalized martensite with high hardness and strength was obtained over a wide range of cooling rates (higher than 200 degrees C/h) during the normalization stage of P91 steel. Within this cooling rate range, twin martensite gradually generated as the cooling rate decreased, which enhanced the brittleness of the normalized P91 steel. When the cooling rate was decreased to 25 degrees C/h, the P91 steel exhibited completely annealed microstructures consisting mainly of bulk alpha-Fe grains, with the formation of continuous M23C6 carbides at the grain boundaries. As a result, the annealed P91 steel had poor hardness and strength, as well as demonstrating increased brittleness. Notably, after tempering, the hardness and strength of normalized martensite were greatly weakened, while the toughness of tempered martensite greatly increased. After the tempering process, the continuous M23C6 GBs in the completely annealed P91 steel partly dissolved, which also remarkably enhanced the toughness.
机译：研究了P91钢在正火阶段不同冷却速度下热处理过程中组织和力学性能的演变。结果表明，在P91钢的正火阶段，在较宽的冷却速度范围内（高于200℃/h），可以获得高硬度和高强度的正火马氏体。在该冷却速度范围内，随着冷却速度的降低，孪晶马氏体逐渐生成，从而提高了正火P91钢的脆性。当冷却速度降低到25℃/h时，P91钢表现出完全退火的微观结构，主要由大块α-Fe晶粒组成，在晶界形成连续的M23C6碳化物。因此，退火后的P91钢硬度和强度较差，脆性也有所增加。值得注意的是，回火后，正火马氏体的硬度和强度大大降低，而回火马氏体的韧性大大提高。回火后，完全退火的P91钢中连续的M23C6 GBs部分溶解，这也显著提高了韧性。

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