本文關鍵詞： 高強度IF鋼 冷軋壓下率 退火工藝 組織、織構 力學性能　出處：《西華大學》2015年碩士論文　論文類型：學位論文

【摘要】：高強度IF鋼是一種在IF鋼中添加P、Si、Mn等固溶強化元素后獲得的高強度汽車鋼板品種,屬于具備深沖性能的高強鋼。這是一種典型的兼具良好的成形性和較高的強度的新型汽車用鋼,是一種理想的汽車用鋼,同時也是現(xiàn)在應用最廣泛的一種汽車板材材料。由于高強IF鋼具有特殊的性能,所以高強IF鋼的研究開發(fā),對現(xiàn)代社會提倡的節(jié)約能源,保護環(huán)境具有十分重要的意義。本文以攀鋼生產(chǎn)的型號為P210P1以及P250P1兩種高強度IF鋼熱軋鋼板為試驗材料,重點研究了冷軋壓下率和退火工藝(退火溫度、保溫時間)對高強IF鋼組織織構和性能的影響。先在攀鋼冷軋實驗室對試驗鋼進行55%、65%、75%和85%四種不同冷軋壓下率的冷軋試驗,再將IF鋼制成退火試樣。然后在實驗室中進行六個不同退火溫度(780℃、800℃、820℃、840℃、860℃、880℃),四個不同保溫時間(30S、60S、90S、120S)的鹽浴爐模擬連續(xù)退火試驗。通過研究冷軋壓下率以及退火工藝兩個因素對高強IF鋼顯微組織、織構還有綜合力學性能的影響程度,以此來確定其最佳冷軋壓下率和退火溫度范圍。顯微組織研究表明:退火再結晶晶粒尺寸隨著冷軋壓下率的增大變得更加細小,分布均勻,從不規(guī)則形狀逐漸成為等軸狀晶粒。而晶粒尺寸隨著退火溫度的增加在增大,且晶粒形狀有從餅狀變?yōu)榈容S狀的趨勢。保溫時間對再結晶晶粒尺寸的影響并不明顯。力學性能測試結果表明:冷軋壓下率的增加,有利于提高高強IF鋼的強度和深沖性能。退火溫度的提高雖然使試驗鋼的強度有所降低,但對提高IF鋼r值,提升高強IF鋼深沖性能是絕對有利的。當冷軋壓下率為75%~85%,退火溫度為860℃附近時,高強IF鋼達到較好的強塑性匹配,具有良好的綜合力學性能�？棙嬔芯勘砻�:高強IF鋼冷軋板的首要織構組分有{112}110、{111}110、{111}112還有{001}110等,γ取向線上{111}112織構是退火后再結晶織構的主要強點。表明適當提高退火溫度,有利于IF鋼再結晶織構的改善,從而獲得良好的深沖性能。以上研究內容,可以在一定程度上指導高強IF鋼的工業(yè)生產(chǎn)。
[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，

本文編號：1527519