退火工艺对高强IF钢组织织构和性能的影响

发布时间：2018-02-23 20:34

  本文关键词： 高强度IF钢 冷轧压下率 退火工艺 组织、织构 力学性能　出处：《西华大学》2015年硕士论文　论文类型：学位论文

【摘要】：高强度IF钢是一种在IF钢中添加P、Si、Mn等固溶强化元素后获得的高强度汽车钢板品种,属于具备深冲性能的高强钢。这是一种典型的兼具良好的成形性和较高的强度的新型汽车用钢,是一种理想的汽车用钢,同时也是现在应用最广泛的一种汽车板材材料。由于高强IF钢具有特殊的性能,所以高强IF钢的研究开发,对现代社会提倡的节约能源,保护环境具有十分重要的意义。本文以攀钢生产的型号为P210P1以及P250P1两种高强度IF钢热轧钢板为试验材料,重点研究了冷轧压下率和退火工艺(退火温度、保温时间)对高强IF钢组织织构和性能的影响。先在攀钢冷轧实验室对试验钢进行55%、65%、75%和85%四种不同冷轧压下率的冷轧试验,再将IF钢制成退火试样。然后在实验室中进行六个不同退火温度(780℃、800℃、820℃、840℃、860℃、880℃),四个不同保温时间(30S、60S、90S、120S)的盐浴炉模拟连续退火试验。通过研究冷轧压下率以及退火工艺两个因素对高强IF钢显微组织、织构还有综合力学性能的影响程度,以此来确定其最佳冷轧压下率和退火温度范围。显微组织研究表明:退火再结晶晶粒尺寸随着冷轧压下率的增大变得更加细小,分布均匀,从不规则形状逐渐成为等轴状晶粒。而晶粒尺寸随着退火温度的增加在增大,且晶粒形状有从饼状变为等轴状的趋势。保温时间对再结晶晶粒尺寸的影响并不明显。力学性能测试结果表明:冷轧压下率的增加,有利于提高高强IF钢的强度和深冲性能。退火温度的提高虽然使试验钢的强度有所降低,但对提高IF钢r值,提升高强IF钢深冲性能是绝对有利的。当冷轧压下率为75%~85%,退火温度为860℃附近时,高强IF钢达到较好的强塑性匹配,具有良好的综合力学性能。织构研究表明:高强IF钢冷轧板的首要织构组分有{112}110、{111}110、{111}112还有{001}110等,γ取向线上{111}112织构是退火后再结晶织构的主要强点。表明适当提高退火温度,有利于IF钢再结晶织构的改善,从而获得良好的深冲性能。以上研究内容,可以在一定程度上指导高强IF钢的工业生产。
[Abstract]:High strength if steel is a kind of high strength automobile steel sheet, which is obtained by adding solid solution strengthening elements such as Pu Si Si mn into if steel. High strength steel with deep drawing properties. This is a typical new type of automotive steel with good formability and high strength. It is an ideal automotive steel. At the same time, it is also the most widely used automobile sheet material. Because of the special properties of high-strength if steel, the research and development of high-strength if steel is an energy saving advocated by modern society. It is of great significance to protect the environment. In this paper, two kinds of hot rolled high strength if steel plates, P210P1 and P250P1, are used as test materials, and the cold rolling reduction rate and annealing process (annealing temperature) are mainly studied. The influence of holding time on the texture and properties of high strength if steel. First, the cold rolling tests were carried out in the cold rolling laboratory of Panzhihua Iron and Steel Co., Ltd., with 55% 65% and 85% different cold rolling reduction rates. The if steel was then made into annealed samples. Six simulated continuous annealing tests of salt bath furnace were carried out at 780 鈩，

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