Development of Monitoring Technique for Creep Deterioration in High Temperature Materials Using Miniaturized Specimens -Establishment of a New SP Creep Testing Method and Its Application-

利用小型化试样监测高温材料蠕变劣化技术的开发-新型SP蠕变测试方法的建立及其应用-

• 批准号: 11555026
• 负责人: HASHIDA Toshiyuki
• 金额: $ 8.77万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555026/
• 关键词: Small Punch Creep Testing; Gas Turbine; Boiler; High Temperature Materials; Creep Deformation Rate; Biaxial Deformation; Creep Deterioration; Larson-Miller Parameters; ラーソン-ミラーパラメーター

A small punch creep (SP-C) testing method using a miniaturized specimen with a dimension of 10mm by 10mm by 0.3mm has been demonstrated for evaluating creep properties and mechanical deterioration due to long-term service operations at high temperatures. This testing method involves the application of a concentrated central load to the specimen rigidly supported at its surrounding region, and determines a central deformation vs. time curve for a given load and temperature. The SP-C method was applied to several types of high temperature boiler and turbine materials, including tungsten-alloyed 9Cr ferritic steel, 316 type stainless steel, and Ni-based super alloys. Experimental results revealed that the overall shapes of the creep curves obtained SP-C tests were qualitatively similar to those obtained from conventional uniaxial creep tests, which clearly delineate primary, secondary, and tertiary creep stages. Bending was a dominant mode of deformation governing the primary creep region, while membrane stretching was dominant mode in the secondary and tertiary creep regions. A correlation with uniaxial creep was determined in terms of stress (load) exponent and apparent activation energy for creep deformation. In particular, the apparent activation energy obtained from the SP-C method was close to that determined from uniaxial creep tests. The rupture data was deduced from the SP-C tests conducted on the used materials using the Larson-Miller parameters. The results demonstrated that the SP-C testing method enables us to determine the effects of the high temperature materials degradation on the creep properties. The above experimental evidence suggests that the SP-C testing technique provides a useful tool for evaluating degradation of creep properties for structural components in-service.

一个小冲孔蠕变（SP-C）测试方法，使用一个尺寸为10 mm × 10 mm × 0.3mm的小型试样已被证明是评估蠕变性能和机械性能退化，由于长期的服务操作在高温下。该测试方法包括将集中的中心载荷施加到在其周围区域刚性支撑的试样上，并确定给定载荷和温度下的中心变形与时间的关系曲线。将SP-C法应用于几种高温锅炉和涡轮机材料，包括钨合金化9 Cr铁素体钢、316型不锈钢和镍基高温合金。实验结果表明，得到的SP-C试验的蠕变曲线的整体形状是定性相似的那些从传统的单轴蠕变试验，它清楚地描绘初级，二级和三级蠕变阶段。弯曲是一个主要的变形模式，而膜拉伸是主导模式，在第二和第三蠕变区。与单轴蠕变的相关性确定的应力（负荷）指数和蠕变变形的表观活化能。特别是，从SP-C方法获得的表观活化能接近单轴蠕变试验确定。断裂数据是从使用Larson-Miller参数对所用材料进行的SP-C试验中推导出来的。结果表明，SP-C测试方法使我们能够确定高温材料降解对蠕变性能的影响。上述实验证据表明，SP-C测试技术提供了一个有用的工具，用于评估在役结构部件的蠕变性能退化。

项目成果

S.Komazaki, M.L.Saucedo-Munoz, T.Takahashi, T.Hashida, T.Shoji: "Small Punch Creep Behavior of Service-Exposed SUS316HTB Superheater Tubes of Fossil Boilers"Proc. of Asian Pacific Conference on Fracture and Strength '01 (APCFS'01) and International Confer

S.Komazaki、M.L.Saucedo-Munoz、T.Takahashi、T.Hashida、T.Shoji：“化石锅炉使用暴露 SUS316HTB 过热器管的小冲头蠕变行为”Proc。

S.Komazaki, M.L.Saucedo-Munoz, T.Takahashi, T.Hashida, T.Shoji: "Small Punch Creep Behavior of Service-Exposed SUS316HTB Superheater Tubes of Fossil Boilers"Proc. of Asian Pacific Conference on Fracture and Strength '01(APCFS'01) and International Confere

S.Komazaki、M.L.Saucedo-Munoz、T.Takahashi、T.Hashida、T.Shoji：“化石锅炉使用暴露 SUS316HTB 过热器管的小冲头蠕变行为”Proc。

Shin-ichi Komazaki, Toshiyuki Hashida, Tetsuo Shoji: "Measurement of Creep Property Degradation of Heat Resistant Steels for Boilers by Small Punch Testing Method"Proceedings of the 37^<th> Symposium on Strength of Materials at High Temperatures (Kawasaki

驹崎真一、桥田敏行、正司哲雄：《用小冲头试验法测定锅炉用耐热钢的蠕变性能劣化》第37届高温材料强度研讨会论文集（川崎）

S.S. Baek, S.L. Lee, I.H. Kwon, H.S. Yu, E.G. Na, J.S. Ha, T. Hashida and S.H. Chung: "New Technique Development of High Temperature Creep Evaluation by Small Punch-Creep Test"Proc. of Asian Pacific Conference on Fracture and Strength '01 (APCFS'Ol) and I

S.S.白，S.L.

Sin-ichi Komazaki, Toshiyuki Hashida, Testuo Shoji and Koshi Suzuki: "Development of Small Punch Tests for Creep Property Measurement of W Alloyed 9%Cr Ferritic Steels"Journal of Testing and Evaluation. Vol. 28, No. 4. 249-256 (2000)

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