作者：李世伟1, 余伟炜2, 蒙新明2, 薛飞3, 陈巍峰4
作者单位：1. 中核核电运行管理有限公司, 浙江 海盐 314300;
2. 苏州热工研究院有限公司, 江苏 苏州 215004;
3. 清华大学材料科学与工程系, 北京 100084;
4. 天津大学化工学院, 天津 300072
关键词：铸造奥氏体不锈钢; 泵壳; 热老化; 动态断裂韧性
摘要：
为研究热老化对AP1000主泵泵壳的制造材料铸造奥氏体不锈钢CF8的动态断裂韧性的影响,采用夏比预裂纹试样,利用示波落锤冲击试验系统研究材料动态断裂韧性随老化时间的变化规律。试验结果表明:400℃下的加速热老化使主泵泵壳材料产生明显的脆化效应,降低材料断裂所需消耗的能量;热老化导致材料动态裂纹扩展阻力曲线下降,对应的动态断裂韧度下降,但在热老化前期短时间内阻力曲线下降程度较大,而在热老化时间500 h后降幅逐渐减小,出现老化饱和迹象。
Thermal aging effect on dynamic fracture toughness of AP1000 main pump casing
LI Shi-wei1, YU Wei-wei2, MENG Xin-ming2, XUE Fei3, CHEN Wei-feng4
1. CNNC Nuclear Power Operations Management Co., Ltd., Haiyan 314300, China;
2. Suzhou Nuclear Power Research Institute, Suzhou 215004, China;
3. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
4. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Abstract: In order to investigate the effect of thermal aging on dynamic fracture toughness of cast austenitic stainless steel typed CF8 material, which is used as the AP1000 main pump casing material, a series of falling weight impact test was conducted on pre-crack specimens. Test results show that there is an obvious embrittlement effect on this steel when it was aged at 400℃ for up to 3 000 hours. During the impact process, the absorbed energy decreases with the aging time increases. In addition, dynamic crack growth resistance curve descends, and it is found that there is a great descending in the early aging stage, while the amplify decreases after aged 500 hours when a saturation occurs.
Keywords: cast austenitic stainless steel; pump casing; thermal aging; dynamic fracture toughness
2014, 40(5): 130-134 收稿日期: 2014-1-28;收到修改稿日期: 2014-3-27
基金项目: 国家科技重大专项(2011ZX06004-009-08);江苏省国际科技合作计划项目(BZ2012026)
作者简介: 李世伟(1973-),男,福建莆田市人,高级工程师,主要从事核电厂在役检查和无损检测技术管理工作。
参考文献
[1] Popelar C H, Anderson C E, Nagy J A. An experimental method for determining dynamic fracture toughness[J].Experimental Mechanics,2000,40(4):542-561.
[2] 李玉龙. 利用三点弯曲试样测试材料起裂韧性的技术展望[J]. 稀有金属材料与工程,1993,22(5):12-18.
[3] Galvez F, Cendon D, Garcia N,et al. Dynamic fracture toughness of a high strength armor steel[J]. Engineering Failure Analysis,2009(16):2567-2575.
[4] Rudlanda L D, Wang Y Y, Wilkowski G, et al. Chara cterizing dynamic fracture toughness of linepipe steels using the pressed-notch drop-weight-tear test specimen[J]. Engineering Fracture Mechanics,2004,71(16-17):2533-2549.
[5] Tronskar J P, Mannan M A, Lai M O. Measurement of fracture initiation toughness and crack resistance in instrumented Charpy impact testing[J]. Engineering Fracture Mechanics,2002(69):321-338.
[6] ASTM E1820-2013 Standard test method for measurement of fracture toughness[S].
[7] GB/T 19748-2005钢材夏比V型缺口摆锤冲击试验仪器化试验方法[S]. 北京:中国标准出版社,2005.
[8] Server W L. General yielding of charpy V-notch and precracked charpy specimens[J]. J. Engng Mat. Tech. Trans. ASME,1978(100):183-188.
[9] 蒙新明,耿波,余伟炜,等. 热老化对核电主管道材料拉伸性能影响[J]. 西安工业大学学报:自然科学版,2009,29(4):335-341.
[10] Landes J D. The blunting line in elastic-plastic fracture[J].Fatigue & Fracture of Engineering Materials & Structures,1995,18(11):1289-1297.
[11] Dawes M G. Elastic-plastic fracture toughness concepts based on the COD and J-integral concepts[M]. American Society for Testing and Materials,1970:307-333.
[12] 王毓. 核电用铸造双相不锈钢热老化行为研究[D]. 西安:西安工业大学,2009.
[13] 刘振亭,刘江南,高巍,等. 热老化对铸造双相不锈钢管道亚结构的影响[J]. 热加工工艺,2010(18):65-68.
[14] 加文哲. 核电一回路铸造双相不锈钢热老化机理研究[D].西安:西安工业大学,2012.
