本文關(guān)鍵詞： 高強(qiáng)度IF鋼 冷軋壓下率 退火工藝 組織、織構(gòu) 力學(xué)性能　出處：《西華大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：高強(qiáng)度IF鋼是一種在IF鋼中添加P、Si、Mn等固溶強(qiáng)化元素后獲得的高強(qiáng)度汽車(chē)鋼板品種,屬于具備深沖性能的高強(qiáng)鋼。這是一種典型的兼具良好的成形性和較高的強(qiáng)度的新型汽車(chē)用鋼,是一種理想的汽車(chē)用鋼,同時(shí)也是現(xiàn)在應(yīng)用最廣泛的一種汽車(chē)板材材料。由于高強(qiáng)IF鋼具有特殊的性能,所以高強(qiáng)IF鋼的研究開(kāi)發(fā),對(duì)現(xiàn)代社會(huì)提倡的節(jié)約能源,保護(hù)環(huán)境具有十分重要的意義。本文以攀鋼生產(chǎn)的型號(hào)為P210P1以及P250P1兩種高強(qiáng)度IF鋼熱軋鋼板為試驗(yàn)材料,重點(diǎn)研究了冷軋壓下率和退火工藝(退火溫度、保溫時(shí)間)對(duì)高強(qiáng)IF鋼組織織構(gòu)和性能的影響。先在攀鋼冷軋實(shí)驗(yàn)室對(duì)試驗(yàn)鋼進(jìn)行55%、65%、75%和85%四種不同冷軋壓下率的冷軋?jiān)囼?yàn),再將IF鋼制成退火試樣。然后在實(shí)驗(yàn)室中進(jìn)行六個(gè)不同退火溫度(780℃、800℃、820℃、840℃、860℃、880℃),四個(gè)不同保溫時(shí)間(30S、60S、90S、120S)的鹽浴爐模擬連續(xù)退火試驗(yàn)。通過(guò)研究冷軋壓下率以及退火工藝兩個(gè)因素對(duì)高強(qiáng)IF鋼顯微組織、織構(gòu)還有綜合力學(xué)性能的影響程度,以此來(lái)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(jié)晶晶粒尺寸隨著冷軋壓下率的增大變得更加細(xì)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(shì)。保溫時(shí)間對(duì)再結(jié)晶晶粒尺寸的影響并不明顯。力學(xué)性能測(cè)試結(jié)果表明:冷軋壓下率的增加,有利于提高高強(qiáng)IF鋼的強(qiáng)度和深沖性能。退火溫度的提高雖然使試驗(yàn)鋼的強(qiáng)度有所降低,但對(duì)提高IF鋼r值,提升高強(qiáng)IF鋼深沖性能是絕對(duì)有利的。當(dāng)冷軋壓下率為75%~85%,退火溫度為860℃附近時(shí),高強(qiáng)IF鋼達(dá)到較好的強(qiáng)塑性匹配,具有良好的綜合力學(xué)性能。織構(gòu)研究表明:高強(qiáng)IF鋼冷軋板的首要織構(gòu)組分有{112}110、{111}110、{111}112還有{001}110等,γ取向線(xiàn)上{111}112織構(gòu)是退火后再結(jié)晶織構(gòu)的主要強(qiáng)點(diǎn)。表明適當(dāng)提高退火溫度,有利于IF鋼再結(jié)晶織構(gòu)的改善,從而獲得良好的深沖性能。以上研究?jī)?nèi)容,可以在一定程度上指導(dǎo)高強(qiáng)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(hào)：1527519