硼含量对激光熔覆沉积TC4钛合金显微组织与力学性能影响  

Effect of Boron Content on Microstructure and Mechanical Property of TC4 Titanium Alloy Fabricated by Laser Cladding Deposition

作　　者：姜沐池 任德春 蔡雨升 赵晓彧 吉海宾[1] 雷家峰[1,2] 杨锐 Jiang Muchi;Ren Dechun;Cai Yusheng;Zhao Xiaoyu;Ji Haibin;Lei Jiafeng;Yang Rui(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]中国科学技术大学材料科学与工程学院,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2022年第10期3777-3784,共8页Rare Metal Materials and Engineering

基　　金：装备预研领域基金(61409230311);中国航发集团产学研合作项目(HFZL2019CXY019)。

摘　　要：基于航空航天领域对高比强度、耐高温以及耐磨损钛合金材料的迫切需求,采用激光熔覆沉积(laser cladding deposition,LCD)技术制备出含硼(B)的TC4钛合金复合材料,并研究了B元素含量对其显微组织和力学性能的影响。结果表明,随着B元素含量增加,可以显著降低LCD成形TC4钛合金的晶粒尺寸,其晶粒尺寸从1294μm降低至28.6μm,在硼元素作用下也逐渐弱化了LCD技术导致的柱状晶现象;当B含量较低时,TC4钛合金LCD成形过程中生成的TiB主要在原始β晶界处富集,随着B元素含量增加,针状TiB逐渐在晶粒内部析出。在LCD成形TC4钛合金复合材料性能方面,随着B含量增加,合金的硬度与强度也逐渐增大,显微硬度(HV)从3067.4 MPa增大至3512.8 MPa,抗拉强度由848 MPa增加至1119.5 MPa,提升了32.02%。There is an urgent demand in aerospace applications to develop titanium alloy materials with high specific strength,high-temperature resistance,and wear resistance.Hence,the TC4 titanium alloy composite material was fabricated by laser cladding deposition(LCD)technology,and the effect of boron(B)content on the microstructure and mechanical properties was studied.The results show that the B element can significantly reduce the grain size of the TC4 titanium alloy as fabricated by LCD.The increment of B content exhibits grain size reduction from 1294μm to 28.6μm,which gradually weakens the columnar grain caused by LCD.When B content is low,the TiB formed during LCD forming process of TC4 titanium alloy mainly enriches at original grain boundary.And with the increase of B content,acicular TiB gradually precipitates inside the grain.Consequently,the hardness(HV)of TC4 composite material increases from 3067.4 MPa to 3512.8 MPa and tensile strength increases from 848 MPa to 1119.5 MPa with an increase of 32.02%.

关 键 词：激光熔覆沉积 TC4钛合金 显微组织 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]