Research Progress on Fatigue-creep Interaction of Heat-resistant Steel for Utility Boilers under Deep Peak Shaving Conditions

AIDOS Tuoliken; LIU Xuemin; WU Yuanyi; GUO Huina; LIU Peng; WU Yuxin

doi:10.27022/j.issn2097-7697.2026.01.007

Journal of Special Equipment ›› 2026, Vol. 1 ›› Issue (1) : 91-99. DOI: 10.27022/j.issn2097-7697.2026.01.007

Research Progress on Fatigue-creep Interaction of Heat-resistant Steel for Utility Boilers under Deep Peak Shaving Conditions

AIDOS Tuoliken¹, LIU Xuemin², WU Yuanyi³, GUO Huina², LIU Peng⁴, WU Yuxin³

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Abstract

Under the background of "double carbon" goal and energy transformation, coal-fired thermal power units are transformed from "base load power supply" to "regulatory power supply" and deep peak regulation and frequent start and stop have become the new normal operation mode. As a result, the pressure-bearing parts of the power plant boiler deviate from the design condition for a long time, under the thermo-mechanical fatigue condition of the alternating coupling of mechanical load and temperature load. The interaction between fatigue and creep significantly accelerates the damage and failure of materials commonly used in high temperature heating surfaces, headers and steam pipes, such as 15CrMoG (P12), 12Cr1MoVG, 12Cr2MoG (P22), 10Cr9Mo1VNbN (P91), 10Cr9MoW2VNbBN (P92), 07Cr18Ni9NbCu3BN (Super304H), 07Cr25Ni21NbN (HR3C). However, there is a lack of systematic comparative study on the failure mechanism of the above-mentioned material system under the specific condition of deep peak shaving. In this paper, low alloy steel heat-resistant steel, martensitic heat-resistant steel and austenitic heat-resistant steel are classified, the damage characteristics and failure mechanism of different generations of materials under flexible operation conditions are analyzed. The results show that under the interaction of fatigue and creep, the above materials have obvious differences in microstructure and precipitation phase evolution, cyclic deformation behavior and oxidation-assisted crack propagation. On this basis, combined with China's current GB/T 30580—2022 The technical guide for the life assessment of main pressure parts of power plant boiler, the applicability and limitations of the life assessment method based on the linear cumulative damage theory under deep peak-shaving conditions are discussed, and the necessity of transforming to the nonlinear model of physical mechanism is highlighted.

Key words

Deep peak regulation / Boiler heat-resistant steels / Creep-fatigue interaction / Damage mechanism / Life prediction

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AIDOS Tuoliken, LIU Xuemin, WU Yuanyi, GUO Huina, LIU Peng, WU Yuxin. Research Progress on Fatigue-creep Interaction of Heat-resistant Steel for Utility Boilers under Deep Peak Shaving Conditions[J]. Journal of Special Equipment, 2026, 1(1): 91-99. https://doi.org/10.27022/j.issn2097-7697.2026.01.007

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