研究了不同硼含量对含碳3.4 %～3.8 %、含硅2.0 %～3.0 %、含锰2.0 %～3.0 %的球墨铸铁铸态及热处理态组织和力学性能的影响。结果表 明：随着硼含量的增加，铸态组织中的碳化物数量增加，硬度提高，冲击韧性下降。当硼含 量大于0.010 %时，铸态组织中出现了明显的网状或断网状碳化物，冲击韧性下降幅度较大 。经淬火、回火后，碳化物发生不同程度的溶解。当硼含量为0.003 %～0.010 %时，热处理 后碳化物基本消失，硬度保持在HRC50左右，冲击韧性达到或超过9 J/cm2；当硼含量超过 0.010 %时，热处理后仍存在断网状或条块状碳化物，硬度稍有增加，冲击韧性明显下降。
The influence of boron on micros tructure and mechanical properties of ductile cast iron with C 3.4 %～3.8 %, Si 2.0 %～3.0 % and Mn 2.0 %～3.0 % has been studied.The results indicated that th e amount of the carbide in the as cast microstructure increases as the boron con tent increases.At the same time, the hardness rises and the impact toughness de clines.When boron content surpasses 0.010 %, there is some clear continuous car bide network or discontinuous carbide network in the microstructure, as a result , the impact toughness declines greatly.After heat treated by quenching and tem pering, the carbide in the cast microstructure decomposes more or less.When the boron content is controlled between 0.003 % and 0.010 %, the carbide in the hea t-treated samples generally disappears, and the hardness keeps about HRC 50, an d the impact toughness comes up to or surpasses 9 J/cm2.However, when boron c ontent surpasses 0.010 %, some discontinuous carbide network or carbide blocks e xist, thus the hardness rises slightly, at the same time, the impact toughness declines obviously.
参考文献
| [1] | Harding R A;Gilbert G N J .Why the Properties of Austemp ered Ductile Irons Should Interest Engineers[J].British Foundryman,1986,79(11):489-496. |
| [2] | Janowak J F;Gundlach R B .Development of a Ductile Iron for Comme rcial Austempering[J].AFS Transactions,1983,91:377-388. |
| [3] | Liu Wenyan;Qu Jingxin;Lin Fuyan .A Study of Bainitic Nodular Cast Iron for Grinding Balls[J].Wear,1997,205:97-100. |
| [4] | Krishnaraj D;Narasimhan H N L;Sesham S .Structure and Properties of ADI as Affected by Low Alloy Addition[J].AFS Transactions,1992,100:105-112. |
| [5] | Park Y J .Continue Cooling Transformation and Cu-Mo Ductile Iron[J].AFS Transactions,1984,92:395-400. |
| [6] | Janowak J F;Morton P A .A Guide to Mechanical Properties Possible by Austempering 1.5 %Ni-0.3 %Mo Ductile Iron[J].AFS Transactions,1984,92:489-498. |
| [7] | 方鸿生;薄祥正;郑燕康.贝氏体组织与贝氏体钢[J].金属热处理,1998(11):2-7. |
| [8] | 黄维刚;方鸿生;郑燕康.Si对Mn-B系空冷贝氏体钢组织与性能的影响[J].金属热处理学报,1997(01):8-13. |
| [9] | 梁吉;张向东;高志栋.新型贝氏体球墨铸铁磨球的研究[J].铸造,1990(06):1-8. |
| [10] | 周荣;胡国忠.控制冷却获得贝氏体/马氏体球墨铸铁[J].铸造,1996(09):14-17. |
| [11] | 吴明祥;郑望林.奥--贝球铁合金磨球的研制和应用[J].铸造,1998(01):34-37. |
| [12] | 仝健民;赵亦兵;王峰 .P-Cu-Ti低合金铸铁磨球材料的热处理研究[J].金属热处理学报,1995,16(03):1-8. |
| [13] | 王茂松.低镍合金球墨铸铁磨球的生产及其在湿式球磨机上的应用[J].铸造,1998(03):25-27. |
| [14] | 王子龙;王 琥.铸态贝氏体抗磨球铁的研究[J].现代铸铁,1992(02):16-21. |
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