液/固体积比对复合铸造A356/Q345组织及性能影响  

Effects of Liquid/Solid Volume Ratio on Microstructure and Mechanical Properties of A356/Q345 by Compound Casting

作　　者：梁晓玉 李元东[1,2] 邱谨[1] 张宁[1] 周宏伟[1,2] 王晟 曹驰[1,3] LIANG Xiaoyu;LI Yuandong;QIU Jin;ZHANG Ning;ZHOU Hongwei;WANG Sheng;CAO Chi(State Key Laboratory of Advanced Processing and Recyeling of Nonferrous Metals,Lanzhou University of Tech-nology,Lanzhou 730050;Key Laboratory of Nonferrous Metal Alloys and Processing,Ministry of Educationg,Lanzhou University of Technology,Lanzhou 730050;Wenzhou Pump and Valve Engineering Research Institute of Lanzhou University of Technology,Wenzhou 325105)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,兰州730050 [3]兰州理工大学温州泵阀工程研究院,温州325105

出　　处：《特种铸造及有色合金》2024年第10期1313-1319,共7页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52261010)。

摘　　要：对Q345钢在700℃下进行热浸镀A356铝合金试验,采用液/固复合铸造法制备A356/Q345双金属复合材料。研究液/固体积比(5.54、6.91、9.93、13.3)对A356/Q345复合材料界面组织特征、厚度、相组成及力学性能的影响。结果表明,界面处均产生良好的冶金结合层,且随着液/固体积比的增大,结合层厚度由17.18μm增大至22.04μm。结合层主要由Al_(9)Fe_(2)Si_(2)相、Al_(8)Fe_(2)Si相和Al_(5)Fe_(2)相组成。铝基体和钢基体的显微硬度基本保持不变,结合层的显微硬度随液/固体积比的增大小幅增加,平均显微硬度(HV)为356.89,远高于铝基体和钢基体的显微硬度。复合材料的抗拉强度和剪切强度呈先增大后减小的趋势,液/固体积比为9.93时,复合材料的综合力学性能最佳,抗拉强度和剪切强度达到了最大值,分别为351.4 MPa和48.3 MPa。Q345 steel was hot-dip plated with A356 aluminum alloy at 700℃,and A356/Q345 bimetallic composites were prepared by liquid-solid compound casting.Effects of liquid/solid volume ratio(5.54,6.91,9.93,13.3)on the microstructure characteristics,thickness,phase composition and mechanical properties of A356/Q345 composites were investigated.The results reveal that a descirable metallurgical bond layer is formed at the interface,and the thick⁃ness of bonding layer is increased from 17.18μm to 22.04μm with the increase of liquid/solid volume ratio,which are mainly composed of Al_(9)Fe_(2)Si_(2),Al_(8)Fe_(2)Si and Al_(5)Fe_(2) phases.The microhardness of aluminum matrix and steel matrix remains basically stable,while that of bonding layer is increased slightly with the increase of liquid/solid volume ratio.The average microhardness of bonding layer is 356.89 HV,which is far higher than that of aluminum matrix and steel matrix.The tensile strength and shear strength of composites are increased firstly and then decreased,reaching the maximum value of 351.4 MPa and 48.3 MPa,respectively,with the liquid/solid volume ratio of 9.93,indicating desir⁃able comprehensive mechanical properties.

关 键 词：A356/Q345复合材料 液/固体积比 复合铸造 界面组织 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程] TG292[金属学及工艺—铸造] TG146.21