钛碳硼复合粒子对ZL205A齿轮室铸件组织和力学性能的影响  

Effect of Ti,C,B Composite Particles on the Microstructure and Mechanical Properties of ZL205A Gear Chamber Castings

作　　者：马文龙 杨力 吴昊 龚小龙 罗辉 樊自田[2] 杨小冬 马训山 MA Wen-long;YANG Li;WU Hao;GONG Xiao-long;LUO Hui;FAN Zi-tian;YANG Xiao-dong;MA Xun-shan(Jianglu Mechinery Electronics Group Co.,Ltd.,Xiangtan 411100,Hunan,China;School of Materials Science and Engineering,Huazhong University of Science and Technology,State Key Laboratory of Material Forming and Mould Technology,Wuhan 030024,Hubei,China)

机构地区：[1]江麓机电集团有限公司,湖南湘潭411100 [2]华中科技大学材料科学与工程学院,材料成形与模具技术全国重点实验室,湖北武汉430000

出　　处：《铸造》2024年第9期1238-1242,共5页Foundry

摘　　要：采用一种新型的Al-TCB中间合金对ZL205A齿轮室铸件进行晶粒细化,研究了添加不同含量的Al-TCB中间合金对齿轮室铸件组织和力学性能的影响。结果表明,Al-TCB加入能明显细化ZL205A合金组织,当加入1.0%Al-TCB时,合金晶粒尺寸由240μm细化至60μm左右,合金晶粒细小、组织均匀、致密度高,析出的钛碳硼复合粒子为初生α-Al生长的异质形核质点。随着Al-TCB中间合金加入量的增加,断口形貌中韧窝区面积和析出相的密度同步增加,合金强韧化效果显著,试样的显微硬度、抗拉强度和伸长率最高达到HV143、502 MPa和5.1%。In this paper,a new type of Al-TCB master alloy is used to refine the grain of ZL205A gear chamber casting,and the effect of adding different Al-TCB master alloy on the microstructure and mechanical properties of gear chamber casting is studied.The results show that the addition of Al-TCB can obviously refine the microstructure of ZL205A alloy.When 1.0%Al-TCB is added,the grain size of the alloy is refined from 240μm to about 60μm,and the alloy has fine grains,uniform structure and high density.The Ti,C,B composite particles are heterogeneous nucleation particles grown by primaryα-Al.With the increase of the addition of Al-TCB master alloy,the dimple area and the density of precipitated phase increase synchronously in the fracture morphology,and the effect of strengthening and toughening the alloy is remarkable.The microhardness,tensile strength and elongation of the sample reach HV143,502 MPa and 5.1%respectively.

关 键 词：钛碳硼复合粒子 ZL205A 齿轮室铸件 组织结构 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]