变质处理对A356合金组织及摩擦磨损性能的影响  

Effect of Modification Treatment on Microstructure and Friction and Wear Properties of A356 Alloy

作　　者：曾凡娇[1] 李便霞[1] ZENG Fan-jiao;LI Bian-xia(College of Mechanical and Electrical Engineering,Henan Vacational College of Agriculture,Zhengzhou 451450,Henan,China)

机构地区：[1]河南农业职业学院机电工程学院,河南郑州451450

出　　处：《铸造》2022年第10期1251-1255,共5页Foundry

摘　　要：研究了Sr变质对A356合金组织及摩擦磨损性能的影响。结果表明:添加0.04%Sr可显著细化共晶硅形貌,使其由未变质铸态下的针片状和板条状转变为细小的颗粒状和蠕虫状。合金布氏硬度(HBW)由未变质时的46.3提高到了58.8,硬度值提高了27%。经0.04%Sr变质后的合金,试样表面磨损形貌较为平滑,犁沟和磨痕浅而细小,并逐渐消失,局部区域出现微小的剥落坑和剥落区,磨损形貌有磨削剥落和粘着痕迹,磨损机制为微小磨粒磨损和粘着磨损。The effect of Sr modification on the microstructure and friction and wear properties of A356 alloy was studied.The results showed that the addition of 0.04%Sr significantly refined the morphology of the eutectic silicon from the needle-like and lath-like for unmodified as-cast alloy to fine granular and worm-like shapes.The Brinell hardness(HBW)has increased from HBW 46.3 for the unmodified alloy to HBW 58.8 for the alloy with the addition of 0.04%Sr,and the hardness value increased by 27%.After the alloy was modified by 0.04%Sr,the wear morphology of the sample surface was relatively smooth,the furrows and wear scars were shallow and fine,and gradually disappeared.There were small spalling pits and spalling areas in some areas.The wear morphology had grinding peeling and adhesion marks,and the wear mechanism was micro abrasive wear+adhesive wear.

关 键 词：A356合金 SR变质 显微组织 摩擦磨损 磨损机制 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.2[金属学及工艺—金属材料]