新型QP工艺与传统QT工艺对先进高强度钢组织性能的影响定稿.doc

CHANGCHUN INSTITUTE OF TECHNOLOGY 毕业设计（论文） 新型QP工艺与传统工艺对先进高强度钢组织性能的影响 长 春 工 程 学 院 本文研究了TRIP800钢经QP（Quenching and partitioning）工艺与 (Quenching and Tempering)工艺在270℃的盐浴温度1min，400℃的配分温度，较长的时间（30s~300s）有利于碳的扩散，保证了碳原子由马氏体向的富集的能力，使得钢取得良好的塑性 （2）QP工艺处理的TRIP800钢板组织是马氏体加残留奥氏体，随着配分时间的增加，钢板中的残余奥氏体的含量逐渐增加，其塑性随之增加； （3）在相同的配分时间下，以400℃的配分温度进行Q-P工艺处理的TRIP800钢比Q-T工艺处理的TRIP800钢具有更高的断面伸长率，即具有更好的塑性； （4）随碳分配时间的增加，屈强比呈下降趋势，相对于Q-T工艺，QP工艺处理的TRIP800钢具有更低的屈强比，即QP工艺处理的TRIP800钢具有更优秀的塑性。 关键词 TRIP钢 工艺 工艺 热处理 Abstract This paper studies the TRIP800 steel after Q P (Quenching and partitioning) process and Q T (Quenching and Tempering) process, with the same distribution of temperature 400 ℃，in a different partition time (30s60s,120s,300s) impacts the tensile strength, the cross section elongation yield strength, crystalline phase organizational. The followings are the conclusions: (1) TRIP800 steel in salt bath temperature of 270 ℃ maintains 1min. With 400 ℃ distribution of temperature, and the longer time(30s ~ 300s), the partition favors the diffusion of carbon from the carbon atoms to ensure the retained austenite to marten site enrichment of the bodys ability to obtain such good ductility TRIP800 steel; (2) Q P Process treated steel sheet is TRIP800 residual austenite marten site, as with the increase of time, the residual austenite steel increased gradually, its plasticity increases; (3) At the same time the partition in the partition 400 ℃ temperature treatment process of TRIP800 QP QT process has a higher elongation, which has a better plasticity than steel processing section TRIP800 steel; (4) With carbon allocation time increases, the yield ratio decreased. Relative to the QT process, Q P Process of TRIP800 steel has a lower yield ratio, namely Q P Process of TRIP800 steel has better ductility. Keywords: TRIP steel， QP Process，QT Technology， Heat treatment，Partition time。目 录 1 绪 论 1 1.1 本课题的来源及研究意义 1 1.1.1 本课题的来源 1 1.2 QP工艺的背景及发展现状 2 1.2.1 QP工艺的背景及研究意义 2 1.2.2