ABSTRACT The background of the NIMS Creep Data Sheet Project, together with the preliminary study and facilities, material selection, and testing method, is summarized. The outcomes from the project are explained, focusing on the long-term creep strength of ferritic and austenitic heat-resistant steels. In some cases, the slope of the stress versus time-to-rupture curve in the long term differed from that in the short term in a manner that was markedly dependent on the type of material. Heat-to-heat variations in creep strength were recognized for ferritic and austenitic steels, even when the chemical compositions of the steels examined were within the range of specifications. The reasons for the heat-to-heat variations were differences in the chemical composition, in the amounts of minor elements, and in the grain size, among others. The existence of inherent creep strength was discovered in the very long term for ferritic heat-resistant steels. The amounts of minor solute elements affect the inherent creep strength, independently of precipitation strengthening or the dislocation structure. An inflection point was observed in the tertiary creep stage for a low-alloy steel and for austenitic stainless steels when precipitation occurred during creep. A region-splitting analysis method was proposed for long-term creep strength evaluation for high-chromium ferritic steels. This method was used to review the allowable stress of high-chromium ferritic steels in Japan. A metallographic atlas, time–temperature–precipitation diagram, and fracture-mode map were proposed for ferritic and austenitic steels on the basis of creep-ruptured specimens. Graphical Abstract

中文翻译：

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NIMS蠕变数据表目录

摘要 总结了NIMS蠕变数据表项目的背景，以及初步研究和设施、材料选择和测试方法。解释了该项目的结果，重点是铁素体和奥氏体耐热钢的长期蠕变强度。在某些情况下，长期应力与断裂时间曲线的斜率与短期不同，其方式明显取决于材料类型。对于铁素体钢和奥氏体钢，蠕变强度的热间变化是公认的，即使所检查钢的化学成分在规格范围内也是如此。热对热变化的原因是化学成分、微量元素含量和晶粒尺寸等方面的差异。铁素体耐热钢长期存在固有蠕变强度。微量溶质元素的量影响固有蠕变强度，与沉淀强化或位错结构无关。当蠕变过程中发生沉淀时，低合金钢和奥氏体不锈钢在三次蠕变阶段观察到一个拐点。提出了一种用于高铬铁素体钢长期蠕变强度评价的区域分裂分析方法。该方法用于审查日本高铬铁素体钢的许用应力。在蠕变断裂试样的基础上，提出了铁素体钢和奥氏体钢的金相图谱、时间-温度-析出图和断裂模式图。图形概要 微量溶质元素的量影响固有蠕变强度，与沉淀强化或位错结构无关。当蠕变过程中发生沉淀时，低合金钢和奥氏体不锈钢在三次蠕变阶段观察到一个拐点。提出了一种用于高铬铁素体钢长期蠕变强度评价的区域分裂分析方法。该方法用于审查日本高铬铁素体钢的许用应力。在蠕变断裂试样的基础上，提出了铁素体钢和奥氏体钢的金相图谱、时间-温度-析出图和断裂模式图。图形概要 微量溶质元素的量影响固有蠕变强度，与沉淀强化或位错结构无关。当蠕变过程中发生沉淀时，低合金钢和奥氏体不锈钢在三次蠕变阶段观察到一个拐点。提出了一种用于高铬铁素体钢长期蠕变强度评价的区域分裂分析方法。该方法用于审查日本高铬铁素体钢的许用应力。在蠕变断裂试样的基础上，提出了铁素体钢和奥氏体钢的金相图谱、时间-温度-析出图和断裂模式图。图形概要 当蠕变过程中发生沉淀时，低合金钢和奥氏体不锈钢在三次蠕变阶段观察到一个拐点。提出了一种用于高铬铁素体钢长期蠕变强度评价的区域分裂分析方法。该方法用于审查日本高铬铁素体钢的许用应力。在蠕变断裂试样的基础上，提出了铁素体钢和奥氏体钢的金相图谱、时间-温度-析出图和断裂模式图。图形概要 当蠕变过程中发生沉淀时，低合金钢和奥氏体不锈钢在三次蠕变阶段观察到一个拐点。提出了一种用于高铬铁素体钢长期蠕变强度评价的区域分裂分析方法。该方法用于审查日本高铬铁素体钢的许用应力。在蠕变断裂试样的基础上，提出了铁素体钢和奥氏体钢的金相图谱、时间-温度-析出图和断裂模式图。图形概要 该方法用于审查日本高铬铁素体钢的许用应力。在蠕变断裂试样的基础上，提出了铁素体钢和奥氏体钢的金相图谱、时间-温度-析出图和断裂模式图。图形概要 该方法用于审查日本高铬铁素体钢的许用应力。在蠕变断裂试样的基础上，提出了铁素体钢和奥氏体钢的金相图谱、时间-温度-析出图和断裂模式图。图形概要