Test data for uniaxial creep on material INCONEL 617 at 850 Celsius and a stress of 43.99 MPa

The Alloy 617 creep rupture data were determined for the high temperature reactor projects (the direct cycle helium turbine project, the nuclear process heat project and the district heating project) of the Federal Republic of Germany and the State of North Rhine Westphalia, the aim being to qualify the alloy for service at temperatures up to 950°C. Alloy 617 was the prime candidate alloy for construction of the He-He intermediate heat exchanger and hot gas ducting. Several batches and product forms (forged bar, rolled plate, pipes and tubes) of the alloy were investigated and special attention was given to the effects of the service environments (helium containing different impurity gases, such as hydrogen, water vapour, carbon monoxide and methane, all at microbar levels, and methane reforming gas mixture) on the properties. In the test machines, these test environments led to carburisation of test pieces. However, analysis of the data showed that the stress rupture data for tests in air, in impure helium and in methane reforming gas lay in the same scatter band at each temperature tested.

The creep rupture tests were carried out in single-specimen and multi-specimen test machines. In the single specimen machines the strain was continuously monitored and strain readings were taken once a day. In the multi-specimen test rigs, there were six strings, each with a different load. There were up to eight test pieces per string and strain measurements were made by interrupting the tests, cooling to room temperature, then measuring the length of each test piece using a travelling microscope. Test interruptions for strain measurements were generally every 1000 h. The tests were carried out according to the German Standard DIN 50118 (1982).

The data (secondary creep rate, time to 1% strain, time to rupture) were used for the formulation of draft nuclear design rules for the high temperature reactor systems, which are summarised in 'Proceedings of the Workshop on Structural Design Criteria for HTR', G Breitbach, F Schubert, H Nickel, Jül-Conf-71, April 1989, Berichte der Kernforschungsanlage Jülich GmbH, ISSN 0344-5798.

In addition to the creep rupture data, Alloy 617 tensile properties, low cycle fatigue and creep crack growth data are stored in MatDB.

617合金（Alloy 617）的蠕变断裂数据（creep rupture data）系针对联邦德国与北莱茵-威斯特伐利亚州的高温反应堆项目（包括直接循环氦气轮机项目、核工艺热项目及区域供热项目）测定，旨在评定该合金在最高950℃下的服役资格。617合金是He-He中间热交换器与热气体管道建造的首选合金。研究涵盖该合金的多个批次与多种产品形态（锻棒、轧制板材、管材），并重点考察了服役环境对材料性能的影响：包括含微量（微巴级）氢气、水蒸气、一氧化碳、甲烷等杂质气体的氦气，以及甲烷重整混合气。在试验机内，这些试验环境会引发试样渗碳。但数据分析显示，在各试验温度下，空气、不纯氦气与甲烷重整气氛中测得的应力断裂数据（stress rupture data）均处于同一散射带内。
蠕变断裂试验采用单试样试验机与多试样试验机开展。单试样试验机可连续监测应变，且每日记录一次应变读数。多试样试验台设有六组加载通道，每组载荷各不相同，每组最多搭载8个试样；应变测量需通过中断试验、冷却至室温后，使用读数显微镜测量各试样长度来完成。应变测量的中断间隔通常为每1000小时一次。所有试验均按照德国标准DIN 50118（1982）执行。
试验所得数据（二次蠕变速率、1%应变达到时间、断裂时间）被用于制定高温反应堆系统的核设计规范草案，相关内容总结于《高温堆结构设计准则研讨会论文集（Proceedings of the Workshop on Structural Design Criteria for HTR）》，作者为G Breitbach、F Schubert、H Nickel，报告编号Jül-Conf-71，1989年4月，刊载于《于利希核研究中心有限公司报告（Berichte der Kernforschungsanlage Jülich GmbH）》，ISSN 0344-5798。
除蠕变断裂数据外，617合金的拉伸性能、低周疲劳及蠕变裂纹扩展数据亦存储于MatDB中。