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通过I&Q(两相区退火+淬火)和I&Q&P(两相区退火+淬火+配分)热处理工艺,采用EPMA、SEM和XRD等手段,研究含Cu低碳钢Cu配分行为及不同配分时间对组织性能的影响。结果表明,在双相区保温过程中,试验钢的C、Cu和Mn三种元素均从铁素体向奥氏体中配分,且Cu元素配分效果明显。经I&Q&P工艺处理的钢的组织是板条马氏体和残余奥氏体,随着Cu配分时间增加,原始晶粒尺寸变大,马氏体组织变大、板条变粗。随着Cu配分时间增加,钢的抗拉强度逐渐减小,伸长率先增加后减小。残余奥氏体体积分数的变化趋势和伸长率的变化趋势基本一致,在配分时间为40 min时,残余奥氏体体积分数和伸长率达到最大值,此时材料综合力学性能最佳,抗拉强度为1076 MPa,强塑积达到26254.4 MPa·%。
The heat treatment process of I & Q (two-phase zone annealing + quenching) and I & Q & P (two-phase zone annealing + quenching + partitioning) were adopted to study the distribution characteristics of Cu in Cu-containing low carbon steel with EPMA, SEM and XRD. Impact. The results show that C, Cu and Mn in the test steel are all distributed from ferrite to austenite in the process of heat preservation in the dual-phase zone, and the effect of Cu element distribution is obvious. The I & Q & P process of steel tissue lath martensite and retained austenite, with the Cu partitioning time increases, the original grain size becomes larger, the martensitic structure becomes larger, the slab thicker. With the increase of Cu dosing time, the tensile strength of steel decreases gradually and the elongation increases first and then decreases. The change tendency of volume fraction of retained austenite and the trend of elongation are basically the same. The volume fraction and elongation of retained austenite reach the maximum value when the partitioning time is 40 min. At this point, the material has the best mechanical properties and tensile strength The strength is 1076 MPa and the strong plastic product reaches 26254.4 MPa ·%.