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研究了吐丝温度及控制冷却制度对72LXA盘条组织和性能的影响。结果表明,在相同的冷却制度下,提高吐丝温度,组织中索氏体化率增加和先析铁素体含量减少,材料强度提高,先析铁素体和索氏体化率是影响材料力学性能的重要因素;加大珠光体形成后的冷却能力,可以抑制片层渗碳体的溶解;通过辊道速度和冷却风量的适当配合,可以提高盘条的通条性能。获得了强度高于1050 MPa的盘条,表明确定的热轧工艺可以满足盘条的力学性能要求。
The influence of the temperature of spinning and cooling control on the microstructure and properties of 72LXA wire rod was studied. The results show that under the same cooling system, the temperature of spinning is increased, the rate of sorbite in the microstructure increases, the content of pro-phase ferrite decreases and the strength of the material increases. The amount of pre-ferrite and sorbite is the most important factor Mechanical properties of an important factor; increase pearlite cooling capacity after formation, can inhibit the dissolution of lamellar cementite; through the appropriate combination of roller speed and cooling air volume, can improve the performance of wire rod. Obtained wire rod strength higher than 1050 MPa, indicating that the determined hot-rolling process can meet the mechanical performance requirements of the wire rod.