采用旋转弯曲疲劳试验对比研究了两种不同氧含量(0.0018%和低于0.001%)中碳微合金非调质钢F45MnV在不同状态(正火、调质和锻造)下的高周疲劳性能.结果表明,在具有均一回火索氏体组织的调质态,低氧料F45MnV-1的疲劳性能优于高氧料F45MnV-2;在具有类似铁索体+珠光体组织的正火态,两种料的高周疲劳性能和疲劳裂纹扩展速率基本一致;锻态F45MnV-1料由于具有细小、均匀的铁素体+珠光体组织,其高周疲劳性能优于正火态F45MnV-1料,而与调质态F45MnV-1接近.对于铁素体+珠光体组织和均匀调质组织,非金属夹杂物对疲劳破坏行为的不同影响是上述试验钢疲劳性能差异的主要原因.此外,两种试验钢的铁素体+珠光体组织的裂纹扩展速率均略低于调质态组织.
High-cycle fatigue properties of the microalloyed medium-carbon steel F45MnV with different oxygen content under different processing conditions (as-normalized, quenched and tempered (QT) and forged) were studied by rotating bending fatigue tests. The results show that the fatigue property of the QT steel F45MnV-1 with lower oxygen content is superior to that of the QT steel F45MnV-2 with higher oxygen content, whereas for the normalized specimens with ferrite plus pearlite microstructure, no significant difference in fatigue strength and fatigue crack growth behavior is observed for the two steels. The as-forged F45MnV-1 steel exhibits much higher fatigue property than that of the as-normalized one for the uniform and finer ferrite and pearlite microstructure of the former,and the similar fatigue property for the as-forged steel is observed compared with that under the as-QT condition. It is suggested that the different effects of nonmetallic inclusion on fatigue behaviors of the tested steels with different mierostructure are the main reason for the above results. Moreover, the fatigue crack growth resistance of ferrite plus pearlite microstructure is slightly superior to that of tempered martensitc for the both steels with different oxygen content.
参考文献
| [1] | Johnson J A;Krauss G;Matlock D K .Fatigue of microalloyed bar steels[SAE Technical Paper,2000-01-0615][R].,2000. |
| [2] | Sankaran S.;Sarma VS.;Padmanabhan KA. .Low cycle fatigue behavior of a multiphase microalloyed medium carbon steel: comparison between ferrite-pearlite and quenched and tempered microstructures[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):328-335. |
| [3] | 孙捷,王丽远,曹新鑫,卢锦德.汽车发动机曲轴断裂失效分析[J].金属热处理,2004(12):79-81. |
| [4] | 查小琴,惠卫军,雍岐龙,董瀚,翁宇庆,龙晋明.微观组织对中碳微合金非调质钢疲劳性能的影响[J].金属热处理,2007(06):92-95. |
| [5] | 查小琴,惠卫军,雍岐龙,董瀚,翁宇庆,龙晋明.钒对中碳非调质钢疲劳性能的影响[J].金属学报,2007(07):719-723. |
| [6] | 惠卫军,董瀚,曾新光,邢献强,李强.超纯洁弹簧钢[J].钢铁,1999(09):68-72. |
| [7] | Murakami Y;Kodama S;Konuma S .Quantitative evaluation of effects of non-metallic inclusions o fatigue strength of high strength steels[J].International Journal of Fatigue,1989,11(05):291-2298. |
| [8] | 井藤賀久岳;高行男;户木尾惠郎 等.高强度鋼の二段折れ曲がりS-N曲线の形態に及ほす清净度の影響[J].日本機械學會論文集(A编),2003,69(10):1450-1455. |
| [9] | 聂义宏;惠卫军;傅万堂 等.洁净度对42CrMo钢疲劳破坏行为的影响[J].材料研究学报,2007,21(zk):123-128. |
| [10] | 惠卫军,赵海民,聂义宏,翁宇庆,董瀚.洁净度对高强度钢高周和超高周疲劳破坏行为的影响[C].2007年中国钢铁年会,2007 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%