采用直流电压降(DCPD)方法测试了316LN 不锈钢在室温和350℃的疲劳裂纹扩展速率,得到室温和350℃下该材料疲劳裂纹扩展门槛值ΔK th ,并分析了试样断口形貌.结果表明：采用 DCPD 方法测得室温和350℃下ΔK th分别为11．9,8．1 MPa??m 1/2,与文献值相符,350℃下的疲劳裂纹扩展速率比室温下的要高2~20倍；在裂纹亚临界扩展区,疲劳裂纹扩展速率与应力强度因子范围服从 Paris 公式,其参数 n 与温度无关,参数 D 与温度成线性正比关系；试样疲劳破坏形式为穿晶断裂.
Fatigue crack growth rates of 31 6LN stainless steel at room temperature and 350 ℃ were measured by the direct current potential drop (DCPD)method,and then the fatigue-crack growth threshold (ΔK th ) at room temperature and 350 ℃ was obtained.The fatigue fracture morphology was also analyzed.The results show that the ΔK th obtained by the DCPD method at room temperature and 350 ℃ was 1 1.9,8.1 MPa?m1/2 respectively, coinciding well with the values from references.The fatigue crack growth rates at 350 ℃ were about 2-20 times as high as those at room temperature.In the subcritical propagation zone,the relationship between fatigue crack growth rate and stress intensity factor range accorded with Paris equation.The parameter m in the equation was temperature-independent while parameter D showed a linearly positive correlation with temperature.The failure mode of the specimen was transgranular fracture.
参考文献
| [1] | Babu, M.N.;Dutt, B.S.;Venugopal, S.;Sasikala, G.;Bhaduri, A.K.;Jayakumar, T.;Raj, B..On the anomalous temperature dependency of fatigue crack growth of SS 316(N) weld[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,201020(20):5122-5129. |
| [2] | P. Johan Singh;C.K. Mukhopadhyay;T. Jayakumar.Understanding fatigue crack propagation in AISI 316 (N) weld using Elber's crack closure concept: Experimental results from GCMOD and acoustic emission techniques[J].International Journal of Fatigue,200712(12):2170-2179. |
| [3] | 于慧臣;张仕朝;李影.不同温度下16Cr3NiWMoVNbE结构钢的低周疲劳行为[J].机械工程材料,2014(2):44-47,53. |
| [4] | 张仕朝;于慧臣;李影.不同应变比下GH3030合金的高温低周疲劳行为[J].机械工程材料,2014(1):56-59,63. |
| [5] | 张剑;赵云松;贾玉亮;杨帅;骆宇时;唐定中.一种镍基单晶高温合金的热机械疲劳行为[J].机械工程材料,2013(8):41-44,49. |
| [6] | 王正;谭伟同;王璐;陈楠.高温低周疲劳短裂纹萌生的数值模拟[J].机械工程材料,2014(3):90-95. |
| [7] | 石炜;温卫东;崔海涛.微动疲劳加载装置的设计及其在典型合金上的应用[J].机械工程材料,2014(1):11-14,51. |
| [8] | 张真源;王弘.304不锈钢的超高周疲劳性能[J].机械工程材料,2008(1):79-80,83. |
| [9] | 闫桂玲;王弘;高庆.平均应力对50钢超高周疲劳性能的影响[J].机械工程材料,2006(12):14-18. |
| [10] | 王弘;高庆.超声疲劳试验方法在40Cr钢疲劳性能研究中的应用[J].机械工程材料,2003(12):29-31. |
| [11] | Nicola Bowler.THEORY OF FOUR-POINT DIRECT-CURRENT POTENTIAL DROP MEASUREMENTS ON A METAL PLATE[J].Research in nondestructive evaluation: a journal of the American Society for Nondestructive Testing,20061(1):29-48. |
| [12] | Peter L. Andresen;Martin M. Morra.Effect of Rising and Falling K Profiles on SCC Growth Rates in High-Temperature Water[J].Journal of pressure vessel technology,20073(3):488-506. |
| [13] | P.L. Andresen;J. Hickling;A. Ahluwalia.Effects of Hydrogen on Stress Corrosion Crack Growth Rate of Nickel Alloys in High-Temperature Water[J].Corrosion: The Journal of Science and Engineering,20089(9):707-720. |
| [14] | Andresen, PL;Morra, MM.IGSCC of non-sensitized stainless steels in high temperature water[J].Journal of Nuclear Materials,20081/2(1/2):97-111. |
| [15] | Chopra, O.K.;Rao, A.S..A review of irradiation effects on LWR core internal materials - IASCC susceptibility and crack growth rates of austenitic stainless steels[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,20113(3):235-256. |
| [16] | 杜东海;余论;陈凯;张乐福;石秀强.直流电压降法应力腐蚀裂纹扩展速率在线测定试验系统[J].理化检验-物理分册,2014(1):25-30,45. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%