研究了五种应力比和四种频率对ＧＣ－４（４０ＣｒＭｎＳｉＭｏＶＡ）钢在３５％ＮａＣｌ中性溶溶液中腐蚀疲劳裂纹扩展（ＣＦＣＧ）特性的影响．结果表明，在高应力比时，ＣＦＣＧ的ｄα／ｄｔ－Ｋｍａｘ曲线存在两个平台区ＰⅠ和ＰⅡ，且（ｄａ／ｄｔ）ＰⅡ＜（ｄａ／ｄｔ）ＰⅠ．ＣＦＣＧ的ｄａ／ｄＮ－△Ｋ曲线的平台区起始值面△Ｋｐ随频率升高呈幂函数关系而降低．从表面电化学反应动力学、裂尖表面形变动力学以及裂尖材料内部氢的扩散动力学三个方面综合考虑，导出了△ＫＰ－ｆ的理论函数关系．该函数关系与ＣＦＣＧ试验数据所显示的函数关系十分一致．
Effects of stress ratio at five levels and loading frequency at four levels on corrosion fatigue crack growth(CFCG) behaviour in 3.5% NaCl solution for GC--4(40CrMnSiMoVA) steel were studied experimentally. Test results about stress ratio effect sLow that there are two plateaus, i.e. PⅠ and PⅡ, in da/dt vs Kmax curve for CFCG as R >0.5 and (da/dt)pⅡ<(da/dt)pⅠ but only one plateau exists as R <0.3. The essential causes for the two Plateau phenomena were tentatively explored, but complete theoretical explanation still needs forther investigation. Test results about frequency effect show that values of stress intensity factor amplitude, △Kp, in onset point of plateau in da/dN vs △K curve for CFCG decrease in a power function manner with the increase of frequency. The corresponding theoretical functional expression of △Kp vs f curve was also derived in this paper, based on comprehensive analysis of three respects of surface electrochemical reaction dynamics, crack tip surface deformation dynamics and hydrogen diffusion dynamics in material interior st crack tip. This expression is well consistent with experimental functional relation shin in test data.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | AndresenPL,FordFP．Mater．Sci．Engng,1988,A103(1):107-1842HagnL．Mater．Sci．Engng,1988,A103(1):193-2053HolroydNJH,HardieD．Corr,Sci,1983,23(6):527-5464路民旭,刘晓坤,王建军,郑修麟．航空学报,1990,11(12):B617-B6215路民旭,吕宝桐,李涛,郑修麟．西北工业大学学报,1992 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%