焊接二次热循环对T23钢粗晶区再热裂纹敏感性的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.012.012

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Abstract The coarse-grained heat-affected zone (CGHAZ) and reheat coarse-grained heat-affected zone (reheat CGHAZ) experienced different second thermal cycle of T23 steel were produced by a Gleeble-3500 thermo-mechanical simulator, and then strain to fracture (STF) tests were carried out. Results showed that CGHAZ experienced thermal cycle of 1 350 ℃ or 780 ℃ still had coarse grain, straight grain boundary configuration and high reheat cracking sensitivity, with a reduction of area of lower than 5%. CGHAZ experienced thermal cycle of 880 ℃, 950 ℃ or 1 100 ℃ had smaller grain size, zigzag grain boundary and low reheat crac-king sensitivity, and the reductions of area were 24.67%, 16.6% and 7.24% respectively. Controlling the peak temperature of the second welding thermal cycle to the range of A_c1-A_c3 can reduce reheat cracking sensitivity.

Key words： T23 steel CGHAZ second welding thermal cycle reheat cracking

Published: 08 May 2018

CLC number:

TG407

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	Articles by authors
	WANG Tiantian
	XU Mengjia
	XU Jijin
	YU Chun
	LU Hao

Cite this article:

WANG Tiantian,XU Mengjia,XU Jijin, et al. Influence of Second Welding Thermal Cycle on Reheat Cracking Sensitivity of CGHAZ in T23 Steel[J]. Materials Reports, 2017, 31(12): 56-59.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.012.012 OR http://www.mater-rep.com/EN/Y2017/V31/I12/56

1 Komai N, Masuyama F, Igarashi M. 10-year experience with T23 (2.25 Cr-1.6 W) and T122 (12Cr-0.4 Mo-2W) in a power boiler [J]. J Pressure Vessel Technol,2005,127(2):190.
2 Wang X, Li X Q, Yang C. Early failure analysis on T23 steel water wall of ultra-supercritical tower furnace [J]. Electric Power,2014,47(12):21(in Chinese).
王学, 李夕强, 杨超. 超超临界塔式炉 T23 水冷壁早期失效分析[J]. 中国电力,2014,47(12):21.
3 Zhao H C, Lin R H, Jia J M. New Heat-resistant steel T23′s performance characteristics and early failure [J]. Proc CSEE,2011,31(20):107(in Chinese).
赵慧传, 凌荣华, 贾建民. 新型耐热钢 T23 的特性与早期失效分析[J]. 中国电机工程学报,2011,31(20):107.
4 Li W B,Shen D J,Xie Y. Failure analysis on weld joint of T23 heat-resistant steels [J].Power Equipment,2015,29(6):443(in Chinese).
李文波, 沈丁杰, 谢亿. T23 耐热钢焊缝失效分析[J]. 发电设备,2015,29(6):443.
5 Wang J, Lu S, Rong L. Thermal cycling, microstructure and mechanical properties of 9Cr2WVTa steel welds [J]. J Mater Process Technol,2015,222:434.
6 Han Y C, Chen X D, Fan Z C. Influence of second thermal cycle on reheat cracking susceptibility of welding CGHAZ in vanadium-modified 2.25Cr1Mo steel[J]. Procedia Eng,2015,130:487.
7 Xu M, Chen J, Lu H. Effects of residual stress and grain boundary character on creep cracking in 2.25Cr-1.6W steel[J]. Mater Sci Eng A,2016,659:188.
8 Nawrocki J G, Dupont J N, Robino C V. The mechanism of stress-relief cracking in a ferritic alloy steel [J]. Weld J,2003,82(2):25.
9 Vinckier A G, Pense A W. WRC bulletin. A review of underclad cracking in pressure-vessel components [M]. New York:Welding Research Council,1973.
10 Park K, Kim S, Chang J. Post-weld heat treatment cracking susceptibility of T23 weld metals for fossil fuel applications [J]. Mater Des,2012,34:699.
11 Tanaka M. Characterization of grain-boundary configuration and fracture surface roughness by fractal geometry and creep-rupture properties of metallic materials [J]. J Mater Sci,1992,27(17):4717.
12 Tanaka M, Iizuka H, Ashihara F. Effects of serrated grain boundaries on the crack growth in austenitic heat-resisting steels during high-temperature creep [J]. J Mater Sci,1988,23(11):3827.