Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (9): 1322-1326.DOI: 10.12068/j.issn.1005-3026.2016.09.022

• Materials & Metallurgy • Previous Articles     Next Articles

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
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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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