热处理温度对半固态挤压锡青铜组织性能的影响  

Effect of Heat Treatment Temperature on Microstructure and Mechanical Properties of Semi-solid Extruded Tin Bronze

作　　者：肖寒[1,2] 段志科 李乃拥 熊迟 周荣锋[1] 卢德宏[1] 蒋业华[1] Xiao Han;Duan Zhike;Li Naiyong;Xiong Chi;Zhou Rongfeng;Lu Dehong;Jiang Yehua(Kunming University of Science and Technology,Kunming 650093,China;University of Strathclyde,Glasgow G11XJ,UK)

机构地区：[1]昆明理工大学,云南昆明650093 [2]University of Strathclyde

出　　处：《稀有金属材料与工程》2019年第1期235-241,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51665024);高等学校博士学科点专项科研基金资助项目(20125314120013);云南省应用基础研究重点项目(2011FA007)和面上项目(2014FB131)

摘　　要：以半固态挤压ZCuSn10P1锡青铜为研究对象,采用光学显微镜、扫描电镜、显微硬度仪、布氏硬度计、拉伸试验机研究了热处理温度对半固态挤压锡青铜微观组织和力学性能的影响规律。结果表明:热处理对半固态挤压锡青铜强度、硬度和组织影响较大。当热处理温度由250℃升高至650℃时,锡青铜抗拉强度先增加后降低,延伸率增加;布氏硬度先增加后降低;固相和固液界面显微硬度增加,液相显微硬度降低;固相平均晶粒尺寸增加,但热处理温度650℃时组织已不是球状而变成蔷薇状。随温度增加,固相中Sn和P元素增加,元素偏析减弱。综合性能较佳的热处理工艺为350℃保温120 min,此时锡青铜抗拉强度为402 MPa,延伸率为4.5%,布氏硬度为1360 MPa,与热处理前相比分别提高了3.88%,60.71%,6.25%。With the semi-solid extruded ZCuSn10P1 tin bronze as the research object, the effects of heat treatment temperature onmicrostructure and mechanical properties of semi-solid extruded tin bronze were investigated by using optical microscopy, scanningelectron microscopy, microhardness test, Brinell hardness test and tensile test machine. The results indicate that the heat treatment has agreat effect on the strength, hardness and microstructure of semi-solid extruded tin bronze. With the heat treatment temperature increasingfrom 250 °C to 650 °C, the tensile strength of tin bronze increases first and then decreases, the elongation increases, and the Brinellhardness increases first and then decreases. The Vickers hardness of the solid zone and solid-liquid interface increases;however, the liquidzone decreases. The average grain of solid phase increases in size, while it is not spherical but rose-like with the temperature of 650 °C.With the increase in temperature, the element contents of Sn and P in the solid phase increase, and element segregation weakens. Thecomprehensive mechanical properties of tin bronze at heat treatment temperature 350 °C for 120 min are fine. Meantime, the tensilestrength is 402 MPa, the elongation is 4.5%, the Brinell hardness is 1360 Mpa;compared with the values before heat treatment, they areincreased by 3.88%, 60.71%, and 6.25%, respectively.

关 键 词：铜合金 半固态挤压 热处理 组织演变 力学性能 

分 类 号：TG146.11[一般工业技术—材料科学与工程]