Research Progress of a Novel Martensitic Heat-Resistant Steel G115

doi:10.11900/0412.1961.2021.00185

Acta Metall Sin

2022, Vol. 58

Issue (3): 311-323 DOI: 10.11900/0412.1961.2021.00185

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Research Progress of a Novel Martensitic Heat-Resistant Steel G115

HE Huansheng¹, YU Liming¹(

), LIU Chenxi¹, LI Huijun¹, GAO Qiuzhi², LIU Yongchang¹(

)

^1.State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China
^2.School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China

Cite this article:

HE Huansheng, YU Liming, LIU Chenxi, LI Huijun, GAO Qiuzhi, LIU Yongchang. Research Progress of a Novel Martensitic Heat-Resistant Steel G115. Acta Metall Sin, 2022, 58(3): 311-323.

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Abstract

Improving the steam temperature and the pressure of the boiler applied in the thermal power could enhance the coal-fired efficiency and reduce the emission of harmful gases. Due to the dual impact of dwindling fossil resources and an exacerbated global greenhouse effect, it is critical to develop new heat-resistant boiler materials for ultra super-critical (USC) units at temperatures of 650^oC and higher. With great thermal conductivity, good fatigue resistance, and low cost, martensitic heat-resistant steel G115, based on P92 steel applied in 600^oC USC units, is a promising steel to be applied to this among all candidate materials. This paper introduces the main chemical composition and the microstructure feature of G115 steel, and the research progress in the areas of microstructure stability, creep performance, fatigue resistance, steam oxidation resistance, and industrial pipe production are summarized, with a focus on the role of Cu-rich phase in G115 steel. Finally, some key points on G115 steel are proposed to provide ideas for future research.

Key words: G115 steel ultra super-critical (USC) units microstructure service performance

Received: 07 May 2021

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(U1960204)

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	Articles by authors
	Huansheng HE
	Liming YU
	Chenxi LIU
	Huijun LI
	Qiuzhi GAO
	Yongchang LIU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00185 OR https://www.ams.org.cn/EN/Y2022/V58/I3/311

Table 1 Chemical compositions of P92, MARBN, SAVE12AD, and G115 steels^[19,26,29]

Fig.1 Schematic of the morphology and distribution of tempered martensite and precipitations in G115 steel

Fig.2 Variations of room temperature and high temperature tensile strength (a) and size of martensitic lath/subgrains, M₂₃C₆, and Laves phase (b) for G115 steel and P92 steel aging at 650^oC for different time^[42-46]

Fig.3 Morphologies and components of Cu-rich phase in initial state for G115 steel

Fig.4 HAADF-STEM image (a) and EDS element maps (b) of the distribution of Cu-rich particles and Laves phase in G115 steel after aging at 650^oC for 1000 h

Fig.5 Distributions of the Laves phase and M₂₃C₆ in G115 steel during aging at 750^oC^[52]

Fig.6 Comparisons of creep life among G115, T91, P92, 3%Co-P92, and MARBN steels at 650^oC^[56,57]

Fig.7 Creep crack morphologies under applied stresses of 250 MPa (a), 230 MPa (b), and 150 MPa (c); crack propagation model corresponding to Figs.7a and b (d); crack propagation model corresponding to Fig.7c (e)^[60]

Fig.8 Mechanism of creep fatigue crack propagation

Fig.9 Comparisons of crack growth rate at different temperatures^[65] (Stress intensity factor range (ΔK) means the stress field intensity at crack tip, which is attained by $Δ K$ = Y(a / w)σ $a$ , Y(a / w) is functions related to pattern geometry, a is the length of cracks, w is the width of specimen, σ is the creep stress)

Table 2 Chemical compositions of G115 steel argon arc welding wire^[75,76]

Table 3 Comparisons of mechanical properties at welded joint with different welding methods^[77]

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