用扫描电子显微镜及微拉伸台对奥氏体-贝氏体球墨铸铁裂纹萌生、扩展的微观过程进行了跟踪观察.结果发现:受拉时微裂纹首先在石墨-基体界面上萌生,并沿界面扩展;基体中的裂纹多数是沿贝氏体铁素体-奥氏体界面扩展,不同取向的基体组织可使裂纹偏转或分叉;主裂纹扩展过程中前方始终存在石墨-基体界面的开裂.此外,还根据实验结果进一步分析了奥氏体-贝氏体球墨铸铁的强韧化机理.
参考文献
| [1] | Tanaka Y;Kage H .Development and Application ofAustempered Spheroidal Graphite Cast Iron[J].Materials Transactions,1992,33(06):543-557. |
| [2] | Sidjanin L;Smallman R E .Metallography of BainiticTransformation in Austempered Ductile Iron[J].Materials Science and Technology,1995,8(12):1095-1103. |
| [3] | 石德珂;郭大展;柴惠芬 .奥氏体-贝氏体球铁的组织与性能[J].西安交通大学学报,1983,17(02):27-37. |
| [4] | Aranzabal J;Gutierrez I;Rodrigue-Ibabe J M et al.Influ-ence of Heat Treatments on Microstructure and Toughnessof Austempered Ductile Iron[J].Materials Science and Technology,1992,8(03):263-273. |
| [5] | Rao P P;Putayunda S K .Influence of Microstructure onFracture Toughness of Austempered Ductile Iron[J].Metallurgical and Materials Transactions,1996,28(07):1457-1470. |
| [6] | Bahmani M.;Varahram N.;Elliott R. .THE RELATIONSHIP BETWEEN FATIGUE STRENGTH AND MICROSTRUCTURE IN AN AUSTEMPERED CU-NI-MN-MO ALLOYED DUCTILE IRON[J].Journal of Materials Science,1997(20):5383-5388. |
| [7] | 郝石坚.现代球墨铸铁[M].北京:煤炭工业出版社,1981 |
| [8] | 何则荣;纪松;林国雄 .铸铁中石墨及石墨-基体界面近区力学行为[J].金属学报,1993,29(04):B153-B156. |
| [9] | He Z R;Lin G X;Ji S.A New Understanding on the Relationamong Microstructure Micro Interfacial Mechanical Be-haviours and Macro Mechanical Properties in Cast Iron[J].Materials Science and Engineering,1997:161-164. |
| [10] | FAN Z K;Smallman R E .Some Observation on the Fractureof Austempered Ductile Iron[J].Scripta Metallurgica et Materialia,1994,31(02):137-142. |
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