摘要:
探讨了800 MPa级冷轧双相钢的成分体系、冷却处理工艺、组织及性能;研究了退火温度、冷却速率对双相钢性能的影响, 分析了双相钢的强化机理, 并且优化了退火工艺参数。结果表明, 冶炼过程采用C-Si-Mn-Cr-V成分体系, 轧制过程采用650℃±20℃的中温卷取, 连续退火过程中快冷段投入高氢 (H2含量20%) 冷却, 冷速达到42~50℃/s, 能够得到由铁素体和马氏体组成的冷轧双相钢DP800, 综合力学性能优良。
Abstract:
The composition system,cooling treatment process,microstructure and performance of 800 MPa dual phase steel have been studied,and the effects of annealing temperature and cooling rate on the properties have been investigated.The strengthening mechanism of dual phase steel was analyzed,and the annealing process parameters were optimized. Results show that smelting process using C-Si-Mn-Cr-V component system,rolling process using 650 ℃ ± 20 ℃ in the temperature coiling,microstructure and mechanical properties can be qualified with cooling rate of 42~50 ℃/s and high content hydrogen H2 of 20%,and cold-rolled dual-phase steels DP800 composed of ferrite and martensite can be obtained,and the comprehensive mechanical properties are excellent.
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