东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (9): 1322-1326.DOI: 10.12068/j.issn.1005-3026.2016.09.022

• 材料与冶金 • 上一篇    下一篇

脉冲电流下黄铜合金H70的力学性能和微观组织

范蓉1, 2, 赵坤民1, 阮金华1, 3, 曹简2   

  1. (1. 大连理工大学 工业装备结构分析国家重点实验室, 辽宁 大连116024; 2. 西北大学 机械工程学院, 埃文斯顿 伊利诺伊州60201; 3. 武汉科技大学 机械自动化学院, 湖北 武汉430081)
  • 收稿日期:2015-05-29 修回日期:2015-05-29 出版日期:2016-09-15 发布日期:2016-09-18
  • 通讯作者: 范蓉
  • 作者简介:范蓉(1986-),女,重庆人,大连理工大学博士研究生.
  • 基金资助:
    国家自然科学基金资助项目(11472072); 美国国家自然科学基金、中央高校基本科研业务费联合资助项目.

Mechanical Properties and Microstructures of Brass Alloy H70 Subjected to Pulse Current

FAN Rong 1,2, ZHAO Kun-min1, RUAN Jin-hua1,3, CAO Jian2   

  1. 1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China; 2. School of Mechanical Engineering, Northwestern University, Evanston Illinois 60201, USA; 3. School of Machinery and Automation, Wuhan University of Science and Technology, Wuhan 430081, China.
  • Received:2015-05-29 Revised:2015-05-29 Online:2016-09-15 Published:2016-09-18
  • Contact: FAN Rong
  • About author:-
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摘要: 在高精度电辅助拉伸系统上进行了一系列H70黄铜合金板材拉伸试验,探讨了脉冲电流持续时间和温度峰值对黄铜合金拉伸性能的影响,并观察了试验前后材料的微观组织.结果表明,脉冲持续时间越长,单次脉冲电流产生的峰值温度越高,H70黄铜合金的抗拉强度越低.在相同预应变下,脉冲电流产生的温度峰值越高,应力回复值下降越明显.当峰值温度高于600℃时,应力回复值接近于初始屈服强度.变形过程引入脉冲电流使黄铜发生明显再结晶,靠近断裂区域,晶粒长大明显,并出现铸态细小等轴晶和粗大枝晶.

关键词: 脉冲电流, 黄铜合金 H70, 力学性能, 再结晶, 微观组织

Abstract: Effects of electric pulse duration and relative peak temperature on mechanical properties were studied by high precision electrically assisted (EA) tension test, and microstructures were observed by metallographic analysis. The results indicated that higher temperature generated by longer electric pulse duration resulted in more reduction in tensile strength. Higher temperature peak generates lower stress recovery at the same prestrain level. When the peak temperature was over than 600℃, stress recovery decreased by 50%, which was nearly the initial yield strength under regular tension test. Recrystallization and grain growth were observed on the specimen after EA tension. Grain refinement and dendritic growth occurred near the fracture area.

Key words: electric pulse, brass alloy H70, mechanical properties, recrystallization, microstructure

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