【摘要】：對采用粉末鍛造技術(shù)生產(chǎn)出的一款Fe-C-Cu汽車發(fā)動(dòng)機(jī)連桿(H16)進(jìn)行了微觀組織分析及力學(xué)性能測試,并研究了影響其疲勞性能的因素.結(jié)果表明:H16粉鍛連桿密度大于7.80 g/cm3,接近全致密,微觀組織無氧化穿透或氧化物網(wǎng)絡(luò),脫碳層厚度在70 μm以內(nèi),微觀組織在不同區(qū)域呈各向異性.利用升降法得到H16粉鍛連桿毛坯在不同存活率下的疲勞極限.結(jié)果表明,其疲勞性能及抗拉強(qiáng)度、屈服強(qiáng)度等力學(xué)性能超越鋼鍛連桿,并且不低于國外同類粉鍛連桿產(chǎn)品.此外,還發(fā)現(xiàn)連桿的彎曲度對疲勞壽命影響較大,而表面噴丸情況及其微觀組織特性對疲勞裂紋萌生的位置有一定影響.
[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.
【作者單位】： 西安交通大學(xué)金屬材料強(qiáng)度國家重點(diǎn)實(shí)驗(yàn)室;青島理工大學(xué)汽車與交通學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目51321003~~
【分類號(hào)】：U464.133.2

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