(1. 東北大學(xué) 材料電磁過程研究教育部重點(diǎn)實(shí)驗(yàn)室，沈陽 110819；
2. 東北大學(xué) 材料科學(xué)與工程學(xué)院，沈陽 110819)
摘 要: 研究終鍛溫度(120~450 ℃)對(duì)高純銅組織及硬度的影響。結(jié)果表明：6道次鍛造后，高純銅試樣心部均出現(xiàn)一個(gè)“X”形的細(xì)晶區(qū)。終鍛溫度為380 ℃和450 ℃時(shí)，試樣發(fā)生再結(jié)晶，晶粒尺寸由邊部向心部逐漸減小，晶粒呈等軸晶狀、存在大量孿晶，終鍛溫度變化對(duì)相同部位晶粒尺寸影響不大。終鍛溫度270 ℃試樣的組織為變形組織，由邊部向心部逐漸變細(xì)，心部晶粒拉長，晶界模糊，孿晶消失；終鍛溫度為120 ℃試樣的變形組織進(jìn)一步破碎細(xì)化。終鍛溫度為380 ℃和450 ℃時(shí)，終鍛溫度對(duì)硬度影響不大，試樣沿豎直中線方向硬度在60 HV至70 HV間波動(dòng)。終鍛溫度為270 ℃和120 ℃時(shí)，試樣硬度值沿豎直中線呈“拱”形分布，中心高、邊部低。終鍛溫度由270 ℃降至120 ℃時(shí)，試樣心部硬度由113 HV升至134 HV，表面附近的硬度由75 HV升至102 HV。
關(guān)鍵字: 多向鍛造；高純銅；變形組織；硬度；再結(jié)晶
（1. Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China;
2. College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China）
Abstract:The effect of final forging temperature (120-450 ℃) on the microstructure and hardness of high purity copper was studied. The results show that after 6 passes of forging, an “X”-shaped fine-grained zone appears in the center of the high-purity copper sample. When the final forging temperature are 380 ℃ and 450 ℃, the dynamic re-crystallization (DRX)occurs on the whole sample, the grain size gradually decreases from the edge to the center, the recrystallized grain presents as equiaxed and composed many twins. The change of final forged temperature has little effect on the grain size in the same position of the sample. The structure of the sample with final forging temperature of 270 ℃ is character as deformed structure. The deformed structure is tapered from the edge to the center, grains in the center area are elongated along horizontal direction, and the twins disappear. When the final forging temperature is 120 ℃, the deformed structure of the part is further broken and refined. When the final forging temperature is higher than 450 ℃, the final forging temperature has little effect on the hardness, and the hardness along the vertical midline of the two specimen is between 60 HV and 70 HV. When the final forging temperature is lower than 270 ℃, hardness distribution along the vertical midline shows as “arch” shape, and the hardness continuously decreases from the edge to the center. When the final forging temperature decreases from 270 ℃ to 120 ℃, the hardness on the center area of the sample increases from 113 HV to 134 HV, and the hardness on the surface area increases from 75 HV to 102 HV.
Key words: multi-directional forging; high purity copper; deformed structure; hardness; re-crystallize
