脉冲电流下黄铜合金H70的力学性能和微观组织

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....

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Published in东北大学学报（自然科学版） Vol. 37; no. 9; pp. 1322 - 1326
Main Author 范蓉 赵坤民 阮金华 曹简
Format Journal Article
LanguageChinese
Published 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 2016
西北大学机械工程学院,埃文斯顿伊利诺伊州60201%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%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
武汉科技大学机械自动化学院,湖北武汉430081%西北大学机械工程学院,埃文斯顿伊利诺伊州60201
Subjects
再结晶
力学性能
微观组织
脉冲电流
黄铜合金H70
力学性能
再结晶
recrystallization
microstructure
微观组织
electric pulse
脉冲电流
brass alloy H70
黄铜合金H70
mechanical properties
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ISSN1005-3026
DOI10.3969/j.issn.1005-3026.2016.09.022

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Summary: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.
Bibliography:21-1344/T
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.
electric pulse; brass alloy H 70; mechanical properties; recrystallization;microstructure
FAN Rong ,ZHAO Kun-min,RUAN Jin-hua,CAO Jian（1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China;
ISSN:1005-3026
DOI:10.3969/j.issn.1005-3026.2016.09.022