超音速微粒轰击诱导表面纳米化对300M钢腐蚀疲劳行为的影响  

Effect of Surface Nanocrystallization Induced by Supersonic Fine Particles Bombardment on Corrosion Fatigue Behavior of 300M Steel

作　　者：熊毅[1,2] 栾泽伟 马云飞 厉勇[4] 查小琴 XIONG Yi;LUAN Zewei;MA Yunfei;LI Yong;ZHA Xiaoqin(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Provincial and Ministerial Co-constrction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology,Henan University of Science and Technology,Luoyang 471023,China;AVIC Jonhon Optronic Technology Co.Ltd.,Luoyang 471003,China;Special Steel Institute,Central Iron and Steel Research Institute,Beijing 100081,China;Luoyang Ship Material Research Institute,Luoyang 471000,China)

机构地区：[1]河南科技大学材料科学与工程学院,洛阳471023 [2]河南科技大学有色金属新材料与先进加工技术省部共建协同创新中心,洛阳471023 [3]中航光电科技股份有限公司,洛阳471003 [4]钢铁研究总院特殊钢研究所,北京100081 [5]中国船舶重工集团第725研究所,洛阳471000

出　　处：《金属学报》2024年第5期627-638,共12页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目Nos.U1804146和52111530068;河南省外专引智计划项目No.HNGD2020009。

摘　　要：300M钢因其具有超高强度和优异塑韧性,常作为起落架的首选材料。但其在“高温、高湿、高盐”的海洋服役环境下易发生腐蚀疲劳失效,而表面强化可以有效提高其抗腐蚀疲劳性能。本工作采用超音速微粒轰击(SFPB)技术对300M超高强度钢进行表面纳米化处理,系统研究了SFPB对300M钢在3.5%NaCl溶液中的腐蚀疲劳行为的影响规律,并对300M钢腐蚀疲劳后的表面形貌、微观组织演变和残余应力松弛进行表征。结果表明,300M钢经SFPB后表层晶粒细化至纳米级,形成梯度纳米结构的同时还存在着高幅值残余压应力。在相同的加载应力水平下,SFPB有效提高了300M钢的腐蚀疲劳寿命。腐蚀疲劳后300M钢表层晶粒尺寸仍处于纳米量级,加载应力水平的增加使次表层位错密度显著增加的同时形变孪晶数量增多。在腐蚀疲劳过程中,300M钢表层由于SFPB诱导产生的残余压应力发生不同程度的松弛现象,残余应力松弛程度随着加载应力水平的增加而明显增加。Although 300M steel is one of the preferred materials for aircraft landing gears and other key load-bearing components in aviation because of its ultra-high strength and excellent ductility,its susceptibility to corrosion fatigue fracture during service in“high temperature,high humidity,and high salt”marine environments is a significant safety hazard.Surface strengthening can effectively improve the corrosion fatigue resistance of materials,thereby improving the reliability of components and extending their service life.Hence,the surface nanocrystallization of 300M ultra-high strength steel via supersonic fine particle bombardment(SFPB)and its effect on the corrosion fatigue behavior of the material in 3.5%NaCl solution was systematically investigated and the surface morphology,microstructure evolution,and residual stress relaxation of 300M steel after corrosion fatigue were characterized.After SFPB,the grain size near the surface was observed to have reduced to the nanoscale,forming gradient nanostructures and high amplitude residual compressive stress.The SFPB treatment effectively improved the corrosion fatigue life of 300M steel at the same loading-stress level.After corrosion fatigue,the grain size of the SFPB-treated 300M steel remained at the nanoscale near the surface,and the increase in the loading stress level caused a significant increase in the dislocation density in the subsurface layer and the number of deformation twins.During the corrosion fatigue loading,the residual compressive stress induced by SFPB in the surface layer of 300M steel relaxed to various degrees,with the degree of residual stress relaxation being significantly higher for higher loading stress levels.

关 键 词：超音速微粒轰击 300M钢 表面纳米化 腐蚀疲劳 微观组织 残余应力松弛 

分 类 号：TG178[金属学及工艺—金属表面处理]