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将2种不同成分的烘烤硬化钢(BH-Mn钢和BH-P钢)加热至800℃,保温2 min后水淬;采用3DAP技术、内耗实验及拉伸性能检测分析Mn和P对超低碳BH钢的间隙原子分布及Cottrell气团的影响,从而得出固溶元素分布对拉伸行为的影响机制.结果显示,在BH-P钢中,P以明显的偏聚形式存在,并和C发生共偏聚现象,从而造成对位错的强烈钉扎,这是导致拉伸过程中BH-P钢产生明显屈服平台的主要原因;在BH-Mn钢中,由于固溶Mn几乎不产生偏聚,而且固溶C的偏聚也很少,因此BH-Mn钢的强度低于BH-P钢,塑性则优于后者;P和C的共同偏聚及其对位错的强烈钉扎能够影响Snoek-Ke-Koster内耗,使Snoek-Ke-Koster峰消失.
Two kinds of bake hardened steels (BH-Mn steel and BH-P steels) were heated to 800 ℃ for 2 min and then water-quenched. Using 3DAP technique, internal friction test and tensile property test, And the influence of Cottrell air mass on the interstitial atomic distribution of low carbon BH steel and the influence mechanism of the solid solution elemental distribution on the tensile behavior were obtained.The results showed that in the BH-P steel, P exists in the form of obvious segregation and C co-segregation phenomenon, resulting in a strong pinning of the dislocations, which is the main cause of yielding BH-P steel yielding platform; in BH-Mn steel, due to the formation of almost no solid solution Mn Segregation and the segregation of solid solution C are few, so the strength of BH-Mn steel is lower than that of BH-P steel, plasticity is better than the latter; co-segregation of P and C and its strong nails Snake can affect the Snoek-Ke-Koster internal friction, leaving the Snoek-Ke-Koster peak disappear.