脉冲激光熔覆成形变半径FeCrNiCu合金圆筒工艺及力学性能  

Process and Mechanical Properties of FeCrNiCu Alloy Cylinder with Variable Radii Prepared by Pulsed Laser Cladding Forming

作　　者：任维彬 曹清林[1] 庄百亮 陈世鑫 Ren Weibin;Cao Qinglin;Zhuang Bailiang;Chen Shixin(Changzhou Key Laboratory for Remanufacturing,Jiangsu University of Technology,Changzhou 213001,China;Jiangsu Branch of China Academy of Machinery Science&Technology Co.,Ltd,Changzhou 213164,China)

机构地区：[1]江苏理工学院常州市装备再制造工程重点实验室,江苏常州213001 [2]机械科学研究总院江苏分院有限公司,江苏常州213164

出　　处：《稀有金属材料与工程》2021年第3期973-978,共6页Rare Metal Materials and Engineering

基　　金：国家科技重大专项项目(2018ZX04026001-008);常州市科技计划资助项目(CJ20180058);国防科技重点实验室基金(6142005180402);常州市装备再制造工程重点实验室开放基金(CRM2018A02)。

摘　　要：针对激光立体成形变半径圆筒件边部及外沿塌陷、热累积效应引起力学性能下降等增材制造难点,提出了脉冲激光成形FeCrNiCu合金圆筒件优化路径及工艺,实现了变半径圆筒结构的直接熔覆成形,验证了该结构件良好的组织构成以及力学性能。结果表明:覆层顶部为细小致密的等轴晶组织,中部由具有定向生长趋势的树枝晶构成,底部由胞状晶构成,晶内及晶间有颗粒状Cr_(7)C_(3)型强化析出相析出。覆层显微硬度(HV)最高值为6750MPa,覆层显微硬度(HV)主要分布在5540~5760 MPa;成形层(纵向)的抗拉强度最大为1070 MPa,抗拉强度范围1010~1070 MPa;成形层(横向)的抗拉强度最大为960 MPa,抗拉强度范围780~960 MPa。覆层冲击韧性分布在511.08~727.54 kJ·m^(-2),相关力学试验验证了该结构件具有优良的力学性能。Aiming at the outer and edge collapse of the cylinder with variable radii prepared by laser cladding forming,the decrease of the mechanical properties caused by the thermal accumulation effect.optimized path and process of Fe Cr Ni Cu alloy cylinder by pulsed laser forming were put forward.The direct cladding forming of the cylinder structure with variable radii was realized,and the good structure and mechanical properties of the structure were verified.The results show that the top of the forming layer is fine and dense equiaxed crystal structure,the middle of the forming part is composed of dendrites with a certain directional growth trend,the bottom of the forming part is composed of cellular crystal,and there are granular Cr_(7)C_(3) enhanced precipitates inside and between the crystals.The highest microhardness(HV0.1)of the coating is 6750 MPa,and the microhardness(HV0.1)of the coating is mainly distributed in 5540~5760 MPa.The maximum longitudinal tensile strength of the forming layer is 1070 MPa,and the tensile strength ranges from 1010 to 1070 MPa.The maximum transverse tensile strength of the forming layer is 960 MPa,and the tensile strength ranges from 780 to 960 MPa.The impact toughness distribution of the coating is 511.08~727.54 k J·m^(-2),and the excellent mechanical properties of the forming part are verified by the relevant mechanical experiments.

关 键 词：脉冲激光 FeCrNiCu合金 激光熔覆 力学性能 

分 类 号：TN249[电子电信—物理电子学]