Fe-C-Cu粉末锻造汽车发动机连杆的组织与力学性能

发布时间：2018-08-17 11:13

【摘要】：对采用粉末锻造技术生产出的一款Fe-C-Cu汽车发动机连杆(H16)进行了微观组织分析及力学性能测试,并研究了影响其疲劳性能的因素.结果表明:H16粉锻连杆密度大于7.80 g/cm3,接近全致密,微观组织无氧化穿透或氧化物网络,脱碳层厚度在70 μm以内,微观组织在不同区域呈各向异性.利用升降法得到H16粉锻连杆毛坯在不同存活率下的疲劳极限.结果表明,其疲劳性能及抗拉强度、屈服强度等力学性能超越钢锻连杆,并且不低于国外同类粉锻连杆产品.此外,还发现连杆的弯曲度对疲劳寿命影响较大,而表面喷丸情况及其微观组织特性对疲劳裂纹萌生的位置有一定影响.
[Abstract]:The microstructure and mechanical properties of a Fe-C-Cu engine connecting rod (H16) produced by powder forging technology were analyzed and the factors affecting its fatigue properties were studied. The results show that the density of the wrought connecting rod is more than 7.80 g / cm ~ 3, which is close to the whole density. There is no oxidation penetration or oxide network in the microstructure. The thickness of the decarburization layer is less than 70 渭 m, and the microstructure is anisotropic in different regions. The fatigue limit of H 16 powder forging rod blank under different survival rates was obtained by means of lifting method. The results show that the fatigue properties, tensile strength, yield strength and other mechanical properties are superior to those of steel forged connecting rod, and are not lower than those of foreign similar powder forging connecting rod products. In addition, it is found that the bending degree of the connecting rod has a great influence on the fatigue life, while the surface shot peening and its microstructure characteristics have some influence on the location of fatigue crack initiation.
【作者单位】：西安交通大学金属材料强度国家重点实验室;青岛理工大学汽车与交通学院;
【基金】：国家自然科学基金资助项目51321003~~
【分类号】：U464.133.2

【相似文献】