【摘要】：金屬強(qiáng)力旋壓技術(shù)可用來生產(chǎn)高精度高性能的回轉(zhuǎn)體零件。本論文以Mg-8.5%Al-0.5%Zn-0.2%Mn(AZ80)鎂合金為研究對(duì)象,采用光學(xué)顯微鏡(OM)和電子背散射衍射(EBSD)等分析手段,研究了固溶工藝和旋壓工藝參數(shù)(旋壓溫度、主軸轉(zhuǎn)速、進(jìn)給比和減薄率等)對(duì)合金微觀組織、織構(gòu)演變和力學(xué)性能的影響。研究結(jié)果如下:筒形件強(qiáng)力熱旋壓研究結(jié)果表明,筒形件旋壓成形所需的工藝參數(shù)范圍為:溫度350-420℃,主軸轉(zhuǎn)速200-400 rev/min以及進(jìn)給比0.07-0.15 mm/rev。AZ80鎂合金筒形件旋壓能承受最大為45%的單道次減薄率。旋壓溫度從300℃升高到420℃時(shí),合金的微觀組織更加均勻,且晶粒尺寸增大;主軸轉(zhuǎn)速和進(jìn)給比的變化對(duì)顯微組織影響不明顯,但是對(duì)拉伸性能尤其是延伸率有顯著的影響。當(dāng)壁厚減薄率增大時(shí),材料的晶粒尺寸降低的同時(shí)顯微硬度明顯提高。EBSD結(jié)果表明,旋壓后大部分晶粒的C軸近似平行于徑向方向,同時(shí)偏轉(zhuǎn)于軸向方向。當(dāng)旋壓溫度為420℃,主軸轉(zhuǎn)速為400 rev/min,進(jìn)給比為0.1 mm/rev和減薄率為45%時(shí),獲得較好的力學(xué)性能:屈服強(qiáng)度、抗拉強(qiáng)度和延伸率分別為181 MPa、308 MPa和9.6%。輪轂強(qiáng)力熱旋壓研究結(jié)果表明,采用413℃×10h的固溶工藝時(shí)獲得較好的成形性和均勻的微觀組織。AZ80筒形件旋壓的實(shí)驗(yàn)結(jié)果,可成功運(yùn)用于AZ80輪轂旋壓,驗(yàn)證了筒形件旋壓實(shí)驗(yàn)的正確性,但是輪轂旋壓所需的工藝參數(shù)范圍更加嚴(yán)格。晶粒尺寸隨著旋壓溫度的升高而增大且變得均勻,而增大進(jìn)給比會(huì)使旋壓組織更加細(xì)小。減薄率的提高會(huì)使晶粒尺寸明顯下降且平均硬度值上升。當(dāng)旋壓溫度為420℃,主軸轉(zhuǎn)速為400 rev/min,進(jìn)給比為0.1 mm/rev和減薄率為50%時(shí),獲得了較好的力學(xué)性能:屈服強(qiáng)度、抗拉強(qiáng)度和延伸率分別為169 MPa、312 MPa和15.8%,相對(duì)于鑄態(tài)組織分別提高了181%、160%和180%。
[Abstract]:Metal-strength spinning technology can be used to produce high-precision and high-performance rotary parts. In this paper, Mg-8.5%Al-0.5%Zn-0.2%Mn (AZ80) magnesium alloy was used as the research object. The solid solution process and spinning process parameters (spinning temperature, spindle rotation speed) were studied by means of optical microscope (OM) and electron backscatter diffraction (EBSD). The effect of feed ratio and thinning rate on microstructure, texture evolution and mechanical properties of the alloy. The results are as follows: the results show that the process parameters required for the spinning of cylindrical parts are 350-420 鈩，

本文編號(hào)：2227052