ABSTRACT Nickel-based alloy 617 with controlled composition (designated as alloy 617M) and ferritic/martensitic 10% Cr steel are candidate materials for the steam rotor forgings in the high and low pressure regions respectively, in the Indian advanced ultra supercritical (AUSC) programme. Present investigation deals with the high cycle fatigue (HCF) behaviour of alloy 617M, 10% Cr steel and the dissimilar metal weld (DMW) joints of alloy 617M and 10% Cr steel over a wide temperature range (300–973 K). Constant life Haigh diagrams corresponding to different cyclic lives were constructed through tests performed using different R-ratios at 973 K.Influence of mean stress was established through Goodman diagrams at 853 K, using different R-ratios. Weld-strength reduction factor was determined based on HCF tests conducted on the DMW joints.

中文翻译：

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先进超超临界应用结构材料的高温疲劳行为

摘要 在印度先进超超临界 (AUSC) 计划中，成分可控的镍基合金 617（指定为合金 617M）和铁素体/马氏体 10% Cr 钢分别是高压和低压区域蒸汽转子锻件的候选材料. 目前的研究涉及合金 617M、10% Cr 钢以及合金 617M 和 10% Cr 钢在宽温度范围 (300-973 K) 的高周疲劳 (HCF) 行为和异种金属焊接 (DMW) 接头。恒定寿命 对应于不同循环寿命的 Haigh 图是通过在 973 K 下使用不同 R 比执行的测试构建的。平均应力的影响通过 853 K 下的古德曼图建立，使用不同的 R 比。焊接强度折减系数是根据对 DMW 接头进行的 HCF 测试确定的。