杨春秀,娄花芬,陈忠平,向朝建,张曦,王苗苗

• 1:中铝科学技术研究院有限公司
• 2:昆明冶金研究院有限公司北京分公司

摘要(Abstract)：

通过立式半连铸方法制备了Cu-40Zn-1Pb-0.15Fe-0.03Ni双相黄铜合金，针对热轧开裂问题，采用Gleeble-3500热模拟机对合金进行圆柱体压缩试验和扁平压缩试验，研究了双相黄铜合金在变形温度为600～780℃及应变速率为0.01～10 s~(-1)的条件下的热变形行为和热轧工艺性能。通过应力-应变曲线分析得到了合金的本构方程，计算绘制了热加工图，分析了热机械加工(TMP)诱导的α-β相变对α和β相的形成和铅颗粒分布的影响，利用热加工图结合显微组织确定了合金的热变形的流变失稳区和最佳变形参数。结果表明：双相黄铜合金加工过程主要存在两个失稳区：1)变形温度为670～710℃,应变速率为2.5～10 s~(-1)的区域；2)变形温度为750～780℃,应变速率为5～10 s~(-1)的区域。在较低温区(690℃以下),合金为α+β双相组织，且随着温度升高合金中β相占比逐渐增大、α相逐渐球化；在中温区(700～750℃),合金基本为β单相组织，利于热轧加工；在高温区(750℃以上),从β相组织的晶界处生长出针状α相，容易造成合金热轧开裂。

关键词(KeyWords)： 铅黄铜;热加工;α相;β相;组织演变;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 杨春秀,娄花芬,陈忠平,向朝建,张曦,王苗苗

DOI: 10.13289/j.issn.1009-6264.2023-0402

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