CAJ | 학술논문

采用粉末冶金方法，经1150℃、H2气氛烧结1 h制得Fe-0.5Mn-xMo-0.5C(x=0,0.25,0.4,0.5)合金。通过金相组织观察、扫描电镜分析及力学性能测试，研究Mo添加对Fe-0.5Mn-0.5C烧结钢显微组织和力学性能的影响规律。结果表明：添加少量的Mo (≤0.5%，质量分数)可以同时提高Fe-0.5Mn-0.5C的烧结密度、抗拉强度、硬度和伸长率。当Mo含量为0.5%时，烧结体的烧结密度、抗拉强度、硬度和伸长率分别达到最大值7.10 g/cm3、426 MPa、92.2 HRB和7.58%。Mo可促进Fe-0.5Mn-0.5C坯体的致密化过程，随Mo含量增加，烧结体的显微组织中珠光体数量增加，片层间距减小；断口形貌图中解理面面积减小，韧窝数量增加。
채용분말야금방법，경1150℃、H2기분소결1 h제득Fe-0.5Mn-xMo-0.5C(x=0,0.25,0.4,0.5)합금。통과금상조직관찰、소묘전경분석급역학성능측시，연구Mo첨가대Fe-0.5Mn-0.5C소결강현미조직화역학성능적영향규률。결과표명：첨가소량적Mo (≤0.5%，질량분수)가이동시제고Fe-0.5Mn-0.5C적소결밀도、항랍강도、경도화신장솔。당Mo함량위0.5%시，소결체적소결밀도、항랍강도、경도화신장솔분별체도최대치7.10 g/cm3、426 MPa、92.2 HRB화7.58%。Mo가촉진Fe-0.5Mn-0.5C배체적치밀화과정，수Mo함량증가，소결체적현미조직중주광체수량증가，편층간거감소；단구형모도중해리면면적감소，인와수량증가。
Powder metallurgy Fe-0.5Mn-xMo-0.5C (x=0, 0.25, 0.4, 0.5) alloys were prepared by sintering the compact at 1 150 ℃ in H2 for 1 h. The effect of Mo addition on microstructure and mechanical properties of Fe-0.5Mn-0.5C sintered steels were analyzed by optical microscope, scanning electron microscope and mechanical properties testing. The results show that small amount of Mo addition (mass fraction ≤0.5%) can improve the sintered density, tensile strength, hardness and elongation of sintered parts simultaneously. When Mo content is 0.5%, the sintered density, tensile strength, hardness and elongation of the sintered parts reach maximum value of 7.10 g/cm3, 426 MPa, 92.2 HRB and 7.58%, respectively. These results come from the facts that Mo can promote the densification of Fe-0.5Mn-0.5C compacts. With Mo content increasing, the amounts of pearlites increase with narrower lamella space; the fraction of cleavage facets decreases and the number of dimples on the fractures of samples increases.