Rheocast of lead-free bismuth bronze and phosphorus bronze utilizing high fluidity slurry manufactured by repeated extrusion process

利用重复挤压工艺制造的高流动性浆料流变铸造无铅铋青铜和磷青铜

• 批准号: 17560653
• 负责人: UETANI Yasuhiro
• 金额: $ 2.18万
• 依托单位: Toyama Prefectural University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560653/
• 关键词: lead-free bismuth bronze; phosphorus bronze; semi-solid slurry; rheocast; granular structure; tensile property; 粒状組織; 引張特性; スラリー; 振動押出; 粒状化; AC4CH合金; 7075合金; A390合金

Semi-solid slurry with fine solid granules for rheocasting was made from lead-free bismuth bronze and phosphorus bronze by passing the low-superheat melt through an opening between a rotating regular octagonal rotor and a circumscribed chill block. At first, we mainly investigated the effect of rotational speed on the structure of a solidified small ingot of lead-free bismuth bronze. The ingot structures changed from the dendrite of rotor-free condition to the rosette at the rotational speed of 50rpm and to the granular with a mean grain size of about 50μm at higher than100rpm. If the slurry made at 100rpm was rheocast to a disk shape by the use of a high pressure casting machine, the disk had almost uniform granular structures from the center to the edge regions. However, the tensile elongation and strength were very low because of the existence of brittle fine dendrite-like structure regions which were generated by rapid cooling of liquid phases during rheocasting. They were drastically improved by lowering cooling rate to suppress the generation of fine dendrite structure regions, especially in the elongation showing much higher than that of conventional squeeze cast sample. On the other hand, the rotor process also produced semi-solid slurry phosphorus bronze with mean granule size of less than 40μm at almost the same processing conditions. When rheocasting utilizing the semi-solid slurry had been carried out at slower cooling rate, the formed sample had a fine grain structure with mean grain size of 30μm. We expect this reocast sample of phosphorus bronze have an excellent tensile property especially in the much higher elongation than that of the conventional castings.

半固体浆液和细固体颗粒用于风湿性颗粒是由无铅的丁香青铜和青铜磷的半固定浆，通过将低渗透液通过旋转的常规八角形转子和围绕的寒冷块之间的开口通过低渗透率融化。首先，我们主要研究了旋转速度对无铅抗二氮的固体小铸型的结构的影响。在50rpm的旋转速度和颗粒状的平均晶粒尺寸高于100rpm时，Ingot结构从无转子条件的树突变为玫瑰花结构。如果通过使用高压铸造机以100rpm制造的浆液为磁盘形状，则磁盘从中心到边缘区域具有几乎均匀的颗粒结构。然而，由于存在脆性细树突状结构区域，拉伸的伸长率和强度非常低，这些区域是通过在晶状体铸造过程中快速冷却液相而产生的。通过降低冷却速率来抑制精细的树突结构区域的产生，尤其是在伸长率上显示出比常规挤压样品的延伸高得多，它们得到了极大的改善。另一方面，在几乎相同的加工条件下，转子过程还产生了半固体浆磷青铜，平均颗粒大小小于40μm。当晶状体铸造使用半固体浆液以缓慢的冷却速率进行时，形成的样品的平均晶粒尺寸为30μm。我们预计，这种磷青铜的重新铸造样品具有出色的拉伸特性，尤其是在更高的伸长率中，其伸长率比常规铸件的伸长率更高。

项目成果

SLEEMによるCu-Zn合金における板状α相の観察

Cu-Zn合金中片状α相的SLEEM观察

• 发表时间: 2005
• 期刊: 銅と銅合金 第44巻・1号
• 作者: 松田健二;I.Mullerova;L.Frank;川畑常眞;上谷保裕;池野 進
• 通讯作者: 池野 進

New quaternary grain boundary precipitate in Al-Mg-Si alloy containing silver

• DOI: 10.1016/j.scriptamat.2006.03.064
• 发表时间: 2006-07
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: K. Matsuda;S. Ikeno;Tatsuo Sato;Y. Uetani

523Kで焼鈍したCu-Zn-Si合金の高分解能透過型電子顕微鏡観察

523K退火Cu-Zn-Si合金的高分辨率透射电子显微镜观察

• 发表时间: 2006
• 期刊: 銅と銅合金 第45巻1号
• 作者: 池野 進;松田健二;浜谷大介;川畑常眞;上谷保裕
• 通讯作者: 上谷保裕

Effect of Polygonal Rotor Process on solidification Structure of Lead-free Bismuth Bronze

多角转子工艺对无铅铋青铜凝固组织的影响

• 发表时间: 2010
• 期刊: Proceedings of The 7th Pacific Rim International Conference on Advanced Materials and Processing (印刷中)
• 作者: T.Kose;Y.Uetani;K.Nakajima;K.Matsuda;S.Ikeno
• 通讯作者: S.Ikeno

機械撹拌による半凝固AI-10%Mg合金ビレットの半連続鋳造と半溶融押出加工

机械搅拌半固态AI-10%Mg合金坯的半连续铸造和半熔融挤压

• 发表时间: 2005
• 期刊: 鋳造工学 第77巻・4号
• 作者: 上谷保裕;末田博之;高木英俊;松田健二;池野 進
• 通讯作者: 池野 進