| WC/ NiCrMo 钢基复合材料的断裂行为及特征 |
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| 引用本文： | 杨瑞成,陈奎,王凯旋,吕学飞.WC/ NiCrMo 钢基复合材料的断裂行为及特征[J].复合材料学报,2005,22(3):130-134. |
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| 作者姓名： | 杨瑞成 陈奎 王凯旋 吕学飞 |
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| 作者单位： | 兰州理工大学甘肃省有色金属新材料重点实验室, 兰州 730050 |
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| 基金项目： | 甘肃省自然科学基金资助项目(ZR96061) |
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| 摘 要： | 采用单边缺口梁(SENB) 法、扫描电镜和电子理论, 研究了碳化钨(WC) 增强钢基复合材料经960～1040 ℃奥氏体化及淬火、回火共12 种状态的断裂行为和断口特征。实验结果表明, 该材料在具有高强度(σbb～2200 MPa,σbc～3000 MPa) 高硬度( HRC 62～68) 的同时, 还具有较高的SENB 断裂韧性(～30 MPa ·m1/2 ), 断口形貌主要特征为WC 解理、基体准解理及分散韧窝和韧窝带。研究发现, 高体积分数(～40 %) 的硬质相对材料的断裂韧性和断裂行为起决定性作用, 基体内存在的具有高共价键强的含碳结构单元和具有较多晶格电子的α-Fe (Ni) 结构单元共同作用, 既给予硬质相以强韧支持, 又产生断裂时的微观延性。
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| 关 键 词： | WC/ 钢基复合材料 硬质相 断裂韧性 断口形貌 价电子结构 |
| 文章编号： | 1000-3851(2005)03-0130-05 |
| 收稿时间： | 2004-07-05 |
| 修稿时间： | 2004-12-29 |
FRACTURE BEHAVIORS AND CHARACTERISTICS OFWC/ NiCrMo STEEL MATRIX COMPOSITES |
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| YANG Ruicheng,Chen Kui,WANG Kaixuan,L Xuefei.FRACTURE BEHAVIORS AND CHARACTERISTICS OFWC/ NiCrMo STEEL MATRIX COMPOSITES[J].Acta Materiae Compositae Sinica,2005,22(3):130-134. |
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| Authors: | YANG Ruicheng Chen Kui WANG Kaixuan L Xuefei |
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| Affiliation: | State Key Lab. of Advanced non-Ferrous Materials, Lanzhou University of Technology, Lanzhou 730050, China |
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| Abstract: | The f racture behaviors and f ractographic features of WC/ NiCrMo steel mat rix composites under 12kinds of conditions, af ter austenization between 960 ～ 1040 ℃ then quenching and tempering, were investigatedusing single edge notched beam ( SENB) method, SEM and elect ron theory analysis. The result s show that thematerial has high st rength (σbb ～2200 MPa, σbc ～3000 MPa) and hardness ( HRC 62～68), and higher fracturetoughness (～30 MPa ·m1/2 ) . The main fractographic appearances are WC cleavage, quasi-cleavage of mat rix, dispersed dimples and dimple bands. The numerous hard phases of WC (～40 %) play a dominant role in f racture toughness and fracture behavior, and based on the alloy elect ron theory, both of the containing carbon st ructure unit swith high bond st rength andα-Fe (Ni) st ructure unit s with more lattice elect ron in mat rix cont ribute to the st rongtough support to the hard phases and lead to micro-ductility during fracture. |
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| Keywords: | WC/steel matrix composites hard phase fracture toughness fracture appearance valence electron structure |
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