Effect of manganese source powders on microstructure and mechanical properties of Fe-Mn-C sintered steel
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摘要: 以电解锰粉和Fe-76% Mn粉末（质量分数）为原料，在600℃和70% N2+30% H2混合气体（体积分数）管式炉中氮化得到三种抗氧化含氮锰源粉末（Mn-3% N、Mn-5% N和FeMn-3% N，质量分数），研究锰含量以及锰源粉末种类对压制烧结Fe-Mn-C烧结钢组织和力学性能的影响。研究表明：使用氮化锰源粉末制备的Fe-Mn-C烧结钢的力学性能明显优于采用电解锰粉为原料制备的同类材料，随着锰源粉末中N含量的升高，烧结钢烧结膨胀率减小，对合金的强化作用增加。以Mn-5% N作为锰源制备的Fe-2Mn-0.5C烧结钢，其拉伸强度为576 MPa，断后延伸率为3.8%，与电解锰粉为锰源相比，烧结钢的拉伸强度和断后延伸率分别提升了29%和123%。使用氮化锰粉作为锰源的烧结钢内孔隙数量减小，珠光体增多，片层间距降低。Abstract: Using the electrolytic manganese powders and Fe-76%Mn powders (mass fraction) as the raw materials, the antioxidative nitrogen-manganese source powders (Mn-3%N, Mn-5%N, and FeMn-3%N, mass fraction) were prepared in the tube furnace with 70%N2 + 30%H2 gas (volume fraction) at 600 ℃, the effects of the manganese mass fraction and the type of manganese source powders on the microstructure and mechanical properties of the Fe-Mn-C sintered steels were investigated. In the results, the mechanical properties of the Fe-Mn-C sintered steels prepared by the nitrogen-manganese source powders are obviously better than those prepared by the electrolytic manganese powders. With the increase of the nitrogen mass fraction in the manganese source powders, the sintering expansion rate of the sintered steels decreases, and the strengthening of the Fe-Mn-C alloy is increased. The tensile strength of the Fe-2Mn-0.5C sintered steels prepared by Mn-5%N powders is 576 MPa, and the fracture elongation is 3.8%, which is improved by 29% and 123%, respectively, compared with those prepared by the electrolytic manganese powders. The number of pores in the sintered steels prepared by the nitrogen-manganese source powders decreases, the pearlite increases, and the lamellar spacing decreases.
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Key words:
- sintered steels /
- manganese powders /
- nitrogenization /
- mechanical properties /
- microstructure
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图 1 Mn质量分数对坯体压制密度的影响
Figure 1. Effect of the Mn mass fraction on the compacted density
图 2 Mn质量分数对试样烧结密度的影响
Figure 2. Effect of the Mn mass fraction on the sintered density of specimen
图 3 Mn质量分数对烧结钢尺寸膨胀率的影响
Figure 3. Effect of the Mn mass fraction on the dimensional expansion ratio of the sintered steels
图 4 Mn质量分数对烧结钢抗拉强度的影响
Figure 4. Effect of the Mn mass fraction on the tensile strength of the sintered steel
图 5 Mn质量分数对烧结钢延伸率的影响
Figure 5. Effect of the Mn mass fraction on the fracture elongation of the sintered steel
图 6 Mn质量分数对烧结钢硬度的影响
Figure 6. Effect of the Mn mass fraction on the hardness of the sintered steel
图 7 不同锰源制备的合金金相组织（Mn质量分数为2%）: （a）电解锰；（b）Fe Mn‒3%N; （c）Mn‒3%N; （d）Mn‒5%N
Figure 7. Microstructure of the sintered steels with the Mn mass fraction of 2%using the different manganese source powders: (a) the electrolytic manganese; (b) Fe Mn‒3%N; (c) Mn‒3%N; (d) Mn‒5%N
表 1 水雾化铁粉化学成分（质量分数）
Table 1. Chemical composition of the water atomized ironpowders
% C Si S P Mn Fe ≤0.01 ≤0.04 ≤0.012 ≤0.012 ≤0.12 余量 
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