CAJ | 학술논문

以铝热反应法制备无昂贵合金元素添加的纳米结构白口铸铁，采用XRD、OM、SEM和拉伸及压缩等分析、测试手段研究碳含量对纳米结构白口铸铁组织和力学性能的影响。结果表明：随碳含量增加，白口铸铁由不同形态的珠光体和渗碳体组成，其中层片状珠光体含量减少，粒状珠光体含量增加；层片状珠光体的片间距分别为165、231和250 nm。碳含量为3.5%，3.7%和4.3%的纳米结构白口铸铁的维氏硬度分别为552、577和575 HV，抗压强度为2224、2460和2220 MPa，抗拉强度为383、416和245 MP，均呈现先增大后减小的趋势；伸长率为3%、2.5%和1%，呈现逐渐下降的趋势。无昂贵合金元素添加的纳米结构白口铸铁的力学性能与Ni-Hard 2铸铁相当。
이려열반응법제비무앙귀합금원소첨가적납미결구백구주철，채용XRD、OM、SEM화랍신급압축등분석、측시수단연구탄함량대납미결구백구주철조직화역학성능적영향。결과표명：수탄함량증가，백구주철유불동형태적주광체화삼탄체조성，기중층편상주광체함량감소，립상주광체함량증가；층편상주광체적편간거분별위165、231화250 nm。탄함량위3.5%，3.7%화4.3%적납미결구백구주철적유씨경도분별위552、577화575 HV，항압강도위2224、2460화2220 MPa，항랍강도위383、416화245 MP，균정현선증대후감소적추세；신장솔위3%、2.5%화1%，정현축점하강적추세。무앙귀합금원소첨가적납미결구백구주철적역학성능여Ni-Hard 2주철상당。
The nanostructure white cast irons without expensive elements were prepared by aluminothermic reaction, the effect of carbon content on its microstructures and mechanical properties was studied by XRD, OM, SEM, tension and compression test . The results show that, the white cast irons consist of pearlite with different shapes and cementite, the lamellar pearlite decreases and granular pearlite increases with increasing the carbon content. The average lamellar spacing of the pearlite phase is 165, 231 and 250 nm, respectively. With increasing carbon content, the vickers hardness of nanostructure white cast iron is 552, 577 and 575 HV, compressive strength is 2 224, 2 460 and 2 220 MPa, and tensile strength is 383, 416 and 245 MPa, respectively, which are all first increases and then decreases with increasing carbon content; the elongation rate is 3%, 2.5% and 1%. The mechanical properties of nanostructure white cast iron without expensive alloying elements are the same to Ni-Hard2 cast iron.