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轧机轧制能力不足时无法完成真正意义上的控轧控冷,设计适当的生产工艺以最大限度地提高产品力学性能十分必要。研究了控制冷却工艺对低碳钢力学性能和微观组织的影响。与空冷相比,采用控制冷却工艺进行冷却,可以提高试验钢的力学性能,减轻试验钢的带状组织。在控制冷却过程中,除开始冷却温度对试验钢的性能影响较大外,分段冷却工艺参数对试验钢性能的提高也起很大作用。结果表明:采用前段冷却为主的工艺生产的试验钢较采用后段冷却为主的工艺生产的试验钢的屈服强度提高50 MPa以上,抗拉强度提高约30 MPa,同时拥有良好的塑性和低温韧性。
It is necessary to design a proper production process so as to maximize the mechanical properties of the product when the mill rolling capacity is not enough. The effects of controlled cooling process on the mechanical properties and microstructure of mild steel were investigated. Compared with air cooling, the use of controlled cooling process for cooling can improve the mechanical properties of the test steel and reduce the test strip steel structure. In controlling the cooling process, in addition to the beginning of the cooling temperature on the performance of the test steel larger, the sub-cooling process parameters also play a significant role in improving the performance of the test steel. The results show that the yield strength of the test steel produced by the former cooling process is higher than that of the test steel produced by the latter cooling process by more than 50 MPa and the tensile strength is about 30 MPa. Meanwhile, the test steel possesses good ductility and low temperature toughness.