温度对H70黄铜冲击性能及其断裂机制影响研究  

Effect of temperature on impact properties and fracture mechanism of H70 brass

作　　者：周新宇 周亚辉 刘克张 魏康 郑王毅 孙宇峰[1] 李建生 ZHOU Xinyu;ZHOU Yahui;LIU Kezhang;WEI Kang;ZHENG Wangyi;SUN Yufeng;LI Jiansheng(School of Materials Science and Engineering,Anhui Polytechnic University,Wuhu 241000,China;State Grid Shaoxing Power Supply Company,Shaoxing 312000,China;Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]安徽工程大学材料科学与工程学院,安徽芜湖241000 [2]国网绍兴供电公司,浙江绍兴312000 [3]南昌航空大学航空构件成形与连接江西省重点实验室,江西南昌330063

出　　处：《兵器材料科学与工程》2025年第2期29-34,共6页Ordnance Material Science and Engineering

基　　金：国家自然科学基金青年项目(52301152);高性能有色金属材料安徽省重点实验室开放基金(YSJS-2023-01);江西省自然科学基金青年项目(20232BAB214009)。

摘　　要：本文通过多向热锻+退火工艺制备出平均晶粒尺寸约为32.5μm的H70黄铜样品,分别在-196、20、200℃下对其进行夏比冲击测试,得到冲击吸收功分别为8.09、6.83、6.20 J,呈典型的负相关变化。结果表明:低温下H70黄铜具有最优的冲击性能,因为其低温下层错能较低,在冲击载荷作用下主要变形机制为孪晶诱导塑性变形,内部产生大量变形孪晶,变形孪晶阻碍位错运动并使位错在晶界处大量塞积,这会消耗更多的能量,从而使低温下的冲击性能优异。随着温度的提高,层错能将进一步增加,变形孪晶逐渐减少,变形机制逐渐转变为位错滑移塑性变形。bstract This work prepared H70 brass samples with average grain size of about 32.5μm by multi⁃directional hot forging+annealing process.Charpy impact tests were carried out at⁃196℃,20℃and 200℃,and the impact absorption energy was 8.09 J,6.83 J and 6.20 J respectively by showing a typical negative correlation trend.The results show that H70 brass have the best impact performance at low temperature since the stacking fault energy of H70 brass is low at low temperature.Under impact load,the main deformation mechanism is twin⁃induced plastic deformation mechanism,and a large number of deformation twins are produced internally.The deformation twins hindered the movement of dislocations and caused a large number of dislocations to be plugged at grain boundaries.These processes would consume more energy,resulting in excellent impact performance at low temperature.Meanwhile,the stacking fault energy would further increase with the temperature expansion,the deformation twins would gradually decrease,and the deformation mechanism would gradually change into dislocation slip plastic deformation mechanism.

关 键 词：温度 H70黄铜 夏比冲击 断裂机制 

分 类 号：TG166.2[金属学及工艺—热处理]