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纳米TiC-TiB2颗粒对球墨铸铁铸态组织和力学性能的影响
Effects of TiC-TiB2 Nanoparticles on Microstructure and Mechanical Properties of As-cast Graphite Ductile Irons
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- DOI:
- 作者:
- 王丙旭 1 ，胡子瑞 1 ，邱 丰 2 ，胡 明 1 ，崔威威 1 ，杨金林 1 ，张 宇 1
WANG Bingxu1 , HU Zirui1 , QIU Feng2 , HU Ming1 , CUI Weiwei1 , YANG Jinlin1 , ZHANG Yu1
- 作者单位:
- 1. 浙江理工大学 机械与自动控制学院，浙江 杭州 310018；2. 吉林大学 材料科学与工程学院，吉林 长春 130022
1. School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China; 2. School of Materials Science and Engineering, Jilin University, Changchun 130022, China
- 关键词:
- 纳米 TiC-TiB2 颗粒；球墨铸铁；铸态组织；力学性能；细化机制
TiC-TiB2 nanoparticles; graphite ductile iron; as-cast microstructure; mechanical properties; refining mechanisms
- 摘要:
- 使用含有预制内生纳米 TiC-TiB2 颗粒的铝基中间合金制备新型球墨铸铁，研究了双相纳米颗粒对球墨铸
铁铸态组织和力学性能的影响。 结果表明，纳米颗粒加入后，铸态组织中石墨球的球化率提高 15.9%，平均直径减小
35.8%，单位面积内数量增加 66.3%。 基体组织中，铁素体含量上升，珠光体层片结构得到明显细化。 力学性能测试中，纳
米颗粒增强球墨铸铁的硬度未发生明显变化，屈服强度提升 5.2%，拉伸强度提升 3%，伸长率提升 32.1%，冲击韧度提
升 50.4%。 断口形貌分析中，发现纳米颗粒的加入能够促进塑性形变，带有河流状花纹的解理平面消失，石墨球周围出
现大量撕裂棱和微小韧窝，断裂机制由脆性断裂转变为韧性断裂。
A new type of ductile cast iron was prepared by aluminum base master alloy containing prefabricated endogenous nano-TiC-TiB2 particles. The effect of dual-phase nano-particles on the as-cast microstructure and mechanical properties of ductile cast iron was studied. The results show that with the addition of nanoparticles, the spheroidization rate of graphite spheres in the as-cast microstructure increases by 15.9%, the average diameter decreases by 35.8%, and the number of graphite spheres per unit area increases by 66.3%. In the matrix, the content of ferrite increases, and the lamellar structure of pearlite is obviously refined. In the test of mechanical properties, the hardness of ductile cast iron reinforced by nanoparticles has no obvious change. The yield strength, tensile strength, elongation and impact toughness of ductile cast iron are increased by 5.2%, 3%, 32.1% and 50.4%, respectively. In the fracture morphology analysis, it is found that the addition of nanoparticles could promote the plastic deformation, the cleavage plane with river pattern disappeared, and a large number of tearing edges and tiny dimples appeared around the graphite spheres. The fracture mechanism change from brittle fracture to ductile fracture.