本文選題：錫青銅　切入點(diǎn)：擠壓成形　出處：《鍛壓技術(shù)》2017年02期

【摘要】：以錫青銅QSn7-0.2合金為研究對(duì)象,通過(guò)進(jìn)行金相、硬度、拉伸、XRD、掃描電鏡等實(shí)驗(yàn)方法來(lái)研究不同的加熱溫度對(duì)擠壓成形后的錫青銅組織性能的影響。結(jié)果表明:加熱至720℃擠壓后坯料的組織性能最佳,尤其是斷面收縮率,從而為下一步旋壓工藝提供最佳的毛坯;并對(duì)加熱至780℃擠壓開裂的原因進(jìn)行分析發(fā)現(xiàn):加熱至780℃時(shí),坯料表面邊部有"錫汗"冒出,隨后擠壓成形的杯形件端面在"錫汗"區(qū)域產(chǎn)生裂紋,對(duì)其組織進(jìn)行分析發(fā)現(xiàn),此區(qū)域顯微組織呈鑄態(tài)樹枝晶,晶內(nèi)偏析明顯,并發(fā)現(xiàn)三元共晶組織(α+δ+Cu_3P),三元共晶體的存在引起合金的熱脆,這是錫青銅杯形件熱擠壓時(shí)產(chǎn)生裂紋的主要原因。
[Abstract]:Taking the tin bronze QSn7-0.2 alloy as the research object, by metallography, hardness, The effects of different heating temperatures on the microstructure and properties of the extruded tin bronze were studied by means of tensile XRD and SEM. The results showed that the microstructure and properties of the extruded billet were the best, especially the shrinkage of the section, after heating to 720 鈩，

本文編號(hào)：1665573