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本文就不同锻比、不同预热处理制度、不同调质工艺对20Cr11MolV钢延性断裂韧度的影响进行了探讨。研究结果表明:足够大的锻比,锻造后用低温淬火(960℃淬油)、高温回火(660 ℃ h)代替普通退火处理,可以获得更高的J_(IC)值。控制碳化物在钢中的数量(析出分数)、大小、形态与分布、是提高本材料强韧性的主要途径。本文对20×10~4 kW汽轮机851 mm末级叶片国产化研制及生产工艺的制订提供了实验依据。
In this paper, different forging ratio, different preheating treatment system, different quenching process ductile fracture toughness of 20Cr11MolV steel were discussed. The results show that higher forging J_ (IC) value can be obtained after forging with low temperature quenching (960 ℃ quenching) and high temperature tempering (660 ℃ h) instead of normal annealing. Control of the amount of carbide in the steel (precipitation fraction), size, morphology and distribution are the main ways to improve the toughness of the material. This article provides an experimental basis for the development of the domestic production of 851 mm final stage blades for 20 × 10 ~ 4 kW turbines.