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近年来,在大型零件的热处理实践方面,特别注意淬火冷却过程的强化冷却问题,例如在水中深冷。用水作为冷却介质,要求研制专用的低碳结构钢,以及对淬火过程零件热应力状态进行试验和计算分析(图1,略)。在这些研究的基础上制定了一系列重要的动力机械零件的加速冷却规范: 1) 功率为1000兆瓦的低压透平圆柱形转子轴,重量约180吨,转子体直径1800毫米,转子材质为29ХН3М2ФАА钢——由奥氏体化温度850℃在水中冷却1小时,油中冷却14小时,然后在630℃回火40小时。经这种处理后,获得以下机械性能组合:σ_(0.2)=600～71 牛/毫米~2;σ_B=710～830牛/毫
In recent years, in the heat treatment practice of large parts, special attention has been paid to the problem of intensive cooling during quench cooling, such as cryogenic cooling in water. Water as a cooling medium, require the development of special low-carbon structural steel, as well as the thermal stress state quenching process parts of the test and calculation analysis (Figure 1, omitted). Based on these studies, a series of important accelerated cooling specifications for power machinery parts were developed: 1) a low-pressure, cylindrical, cylindrical rotor shaft with a power of 1000 MW, weighing about 180 tons, with a rotor body of 1800 mm in diameter and a rotor made of 29ХН3М2ФАА Steel - Cooled in water for 1 hour at an austenitizing temperature of 850 ° C. Oil was cooled for 14 hours and then tempered at 630 ° C for 40 hours. After this treatment, the following mechanical properties are obtained: σ_ (0.2) = 600 to 71 N / mm 2; σ_B = 710 to 830 N / mm