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对一种含0.27%C的工程机械用低合金高强度耐磨钢NM500进行轧制及两相区热处理试验,研究了普通高温轧制+空冷、高温控制轧制+空冷、高温控制轧制+层流冷却以及低温控制轧制+层流冷却工艺参数对实验钢两相区热处理后力学性能和三体冲击磨料磨损性能的影响。结果表明,轧制及轧后冷却工艺参数对试验钢两相区热处理后的性能影响较大,低温控制轧制+层流冷却较好的细化了原始铁素体晶粒,在经过适当的两相区热处理后得到保留,有利于提高实验钢的低温冲击韧性和耐磨性能。
A kind of low alloy high strength and wear resistant steel NM500 for construction machinery with 0.27% C was subjected to rolling and two-phase heat treatment tests. The effects of common high temperature rolling + air cooling, high temperature controlled rolling + air cooling, high temperature controlled rolling + Laminar cooling and the influence of the parameters of low temperature controlled rolling and laminar cooling on the mechanical properties and the wear resistance of three-body impact abrasive in two-phase zone of experimental steel after heat treatment. The results show that the parameters of the cooling process and the post-rolling cooling process have a great influence on the performance of the test steel in the two-phase zone after heat treatment. The low-temperature controlled rolling and laminar cooling refine the original ferrite grains well, The two-phase zone is retained after heat treatment, which is beneficial to improve the low temperature impact toughness and wear resistance of experimental steel.