CAJ | 학술논문

通过直接淬火、Q&P、回火等工艺对一种低碳含铜钢进行热处理,并使用拉伸试验机、落锤冲击试验机、扫描电镜、电子探针、X射线衍射、透射电镜等手段对其力学性能、显微组织和冲击性能进行表征.在连续冷却淬火过程中观察到碳在马氏体和残余奥氏体间的动态配分现象,Q&P处理和低温回火可改善实验钢的冲击韧性；实验钢综合力学性能良好：强塑积大于20 GPa%,抗拉强度超过1400 MPa,延伸率约14%,室温冲击功高于40 J.结果表明,所开发的实验钢可以满足热冲压工艺对成形淬火一体化的要求,可作为具有高强塑积的热成形用钢.
통과직접쉬화、Q&P、회화등공예대일충저탄함동강진행열처리,병사용랍신시험궤、락추충격시험궤、소묘전경、전자탐침、X사선연사、투사전경등수단대기역학성능、현미조직화충격성능진행표정.재련속냉각쉬화과정중관찰도탄재마씨체화잔여오씨체간적동태배분현상,Q&P처리화저온회화가개선실험강적충격인성；실험강종합역학성능량호：강소적대우20 GPa%,항랍강도초과1400 MPa,연신솔약14%,실온충격공고우40 J.결과표명,소개발적실험강가이만족열충압공예대성형쉬화일체화적요구,가작위구유고강소적적열성형용강.
A low-carbon steel with Cu addition was heat-treated by direct quenching,Q&P (quenching and partitioning)and tempering processes.The mechanical properties and impact toughness of the test steel were investigated by universal testing machine and drop weight impact testing machine.The microstructure was characterized by SEM (scan electron microscope ), EPMA(electron probe microanalysis),XRD (X-ray diffraction)and TEM (transmission electron microscope ). The results show that the phenomenon of dynamic carbon partitioning from martensite to retained austenite in the continuous cooling process is observed and the impact toughness of test steel is improved by Q&P process and tempering process.The test steel has a good comprehensive mechanical properties: the product of tensile strength and elongation,the tensile strength,the total elongation and the impact toughness at room temperature are 20 GPa%, 1 400 MPa,14% and 40 J,respectively.The test steel based on dynamic carbon partitioning mechanism can meet the requirement of hot-stamping process and can be used as an excellent hot stamping steel with high product of strength and elongation.