Effect of aging time on the microstructure and mechanical properties of the SP2215 steel welded joint

JIN Xiaokun; ZHANG Shichao; DIAO Wangzhan; DU Jinfeng; LIANG Jun; ZHANG Zheng

doi:10.12073/j.hjxb.20221028006

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2023 > 44(9): 95-105. > DOI: 10.12073/j.hjxb.20221028006

JIN Xiaokun, ZHANG Shichao, DIAO Wangzhan, DU Jinfeng, LIANG Jun, ZHANG Zheng. Effect of aging time on the microstructure and mechanical properties of the SP2215 steel welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(9): 95-105. DOI: 10.12073/j.hjxb.20221028006

Citation:

PDF (4992 KB)

Effect of aging time on the microstructure and mechanical properties of the SP2215 steel welded joint

1.
CHN Energy New Energy Technology Research Institute Co., Ltd., Beijing, 102209
2.
Beihang University, Beijing, 100191
3.
Harbin Boilers Co., Ltd., State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers, Harbin, 150046

More Information

Received Date: October 27, 2022
Available Online: July 10, 2023

Graphical Abstract

Abstract

Abstract

SP2215 tube welded joints (WJ) were prepared by manual gas tungsten arc welding (M-GTAW) and ERNiCr-3 welding wire. The microstructure, mechanical properties and tensile fracture mechanism of the WJ after aging for different times at 650 ℃ were studied. The results show that the microstructure of SP2215 base metal (BM) is composed of austenite, a small amount of twins and primary NbN and Z phase in the as-welded condition, the weld metal (WM) was solidified into columnar dendrite with a completely austenitic structure, and Nb element was segregated between the dendrites and forms the NbC phase, which was distributed in a chain shape. After aging at 650 ℃ for 50 h, M₂₃C₆ began to precipitate at the austenite grain boundary of SP2215 BM and gradually coarsened with the extension of aging time, at the same time NbC phase gradually precipitated between dendrites and gradually formed into a cluster shape with the increase of aging time. The microhardness of BM and WM increases with the increasing of aging time, and reaches the maximum value at 500 h. The hardness of BM is always higher than that of WM. All the WJ with different aging time were fractured at the weld seam in a ductile manner at room temperature tensile test, however the fracture initiation position and fracture direction changed with the extension of aging time. When the aging time was 0-114 h, the fracture direction was transverse to the columnar dendrite direction, and the crack initiation position was the primary NbC particles between dendrites. When the aging time was 500-2012 h, the fracture direction was parallel to the columnar dendrite direction, and the crack initiation position is the dendritic core. The fracture position of the WJ changed from the weld seam to the SP2215 side with the increase of aging time at high temperature tensile test at 650 ℃. The WJ aging for 0-114 h fractured at the weld seam in a ductile manner, however the WJ aging for 2012 h fractured at the SP2215 side in a quasi-cleavage manner.
- austenitic heat-resistant steel,
- welded joint,
- aging,
- microstructure,
- mechanical properties

FullText(HTML)

References (14)

References

段鹏. 超超临界机组耐热钢和高温合金的性能劣化研究[D]. 北京: 华北电力大学, 2021.

Duan Peng. Study on performance degradation of heat resistant steel and superalloy in ultra-supercritical units[D]. Beijing: North China Electric Power University, 2021.

戴佩馄, 程钧培. 火力发电新技术发展[J]. 发电设备, 2004, 1: 4 − 9. doi: 10.3969/j.issn.1671-086X.2004.01.001

Dai Peihun, Cheng Junpei. Development of new techniques in thermal power generation[J]. Power Equipment, 2004, 1: 4 − 9. doi: 10.3969/j.issn.1671-086X.2004.01.001

刘正东, 陈正宗, 何西扣, 等. 630 ~ 700 ℃超超临界燃煤电站耐热管及其制造技术进展[J]. 金属学报, 2020, 56(4): 539 − 548.

Liu Zhengdong, Chen Zhengzong, He Xikou, et al. Systematical innovation of heat resistant materials used for 630 ~ 700 ℃ advanced ultra-supercritical(A-USC) fossil fired boilers[J]. Acta Metallurgica Sinica, 2020, 56(4): 539 − 548.

冯琰磊, 叶勇健. 630 ~ 650 ℃参数机组锅炉关键材料分析[J]. 电力勘探设计, 2019, 7: 36 − 41.

Feng Yanlei, Ye Yongjian. Analysis of key materials for boilers of 630 ~ 650 ℃ parameter coal-fired units[J]. Electric Power Survey & Design, 2019, 7: 36 − 41.

李赞. 超(超)临界锅炉用钢及其焊接性[J]. 技术与市场, 2019, 26(11): 53 − 54.

Li Zan. Ultra-supercritical boiler steel and its weldability[J]. Technology and Market, 2019, 26(11): 53 − 54.

于鸿垚, 董建新, 谢锡善. 新型奥氏体耐热钢HR3C的研究进展[J]. 世界钢铁, 2010, 2: 42 − 49.

Yu Hongyao, Dong Jianxin, Xie Xishan. Research development of new austenitic heat-resistant steel HR3C[J]. Word Iron & Steel, 2010, 2: 42 − 49.

宋有明. T92/HR3C、T92/TP347H异种钢焊接接头的高温组织结构与力学性能研究[D]. 合肥: 合肥工业大学, 2012.

Song Youming. Studies on high-temperature microstructures and mechanical properties of the T92/HR3C and T92/TP347H dissimilar steel weld joints[D]. Hefei: Hefei University of Technology, 2012.

谢锡善, 艾卓群, 迟成宇, 等. 620 ~ 650 ℃锅炉过热器/再热器用新型奥氏体耐热钢SP2215的研发[J]. 钢管, 2018, 47(1): 23 − 29.

Xie Xishan, Ai Zhuoqun, Chi Chengyu, et al. R & D of the new type SP2215 austenitic heat-resistant steel for servicing 620 ~ 650 ℃ boiler super heater/reheater[J]. Steel Pipe, 2018, 47(1): 23 − 29.

高虹, 陈泽民, 何周苏秦, 等. 超超临界火电锅炉用新型奥氏体耐热合金无缝管的研制[J]. 现代冶金, 2020, 48(4): 4 − 11.

Gao Hong, Chen Zemin, He Zhousuqin, et al. Development of new type austenitic heat-resistant alloy seamless tube for ultra supercritical thermal power boiler[J]. Modern Metallurgy, 2020, 48(4): 4 − 11.

阮米庆, 范引鹤, 顾海锋. 奥氏体型合金熔化焊接头微观组织不均匀性及对疲劳性能影响的研究[J]. 稀有金属材料与工程, 1999, 28(1): 30 − 33.

Ruan Miqing, Fan Yinhe, Gu Haifeng. Microstructural nonuniformity and fatigue properties of welded joints of austenitic alloys[J]. Rare Metal Materials and Engineering, 1999, 28(1): 30 − 33.

曹建. 超超临界机组用T/P92异种钢焊接接头结构与性能的研究[D]. 上海: 复旦大学, 2011.

Cao Jian. Research on Microstructure and properties of T/P92 dissimilar materials joints in USC boilers[D]. Shanghai: Fudan University, 2011.

Zhang Yu, Jing Hongyang, Xu Lianyong, et al. Microstructure and mechanical performance of welded joint between a novel heat-resistant steel and Inconel 617 weld metal[J]. Materials Characterization, 2018, 139: 279 − 292. doi: 10.1016/j.matchar.2018.03.012

Zhang Yu, Jing Hongyang, Xu Lianyong, et al. Creep behavior and life assessment of a novel heat-resistant austenite steel and its weldment[J]. Acta Metallurgica Sinica(English Letters), 2019, 32(5): 638 − 650. doi: 10.1007/s40195-018-0822-5

Zhang Yu, Jing Hongyang, Xu Lianyong, et al. Fusion boundary evolution, precipitation behaviour, and interaction with dislocations in an Fe-22Cr-15Ni steel weldment during long-term creep[J]. Progress in Natural Science:Materials International, 2019, 29: 41 − 49. doi: 10.1016/j.pnsc.2019.01.002

[1]	ZHAO Pengfei, WANG Xuhao, GUO Yang, WANG Ting, ZHANG Yusheng, XU Jian, MAO Guijun. Effect of welding speed on microstructure and mechanical properties of electron beam welded joints of 12Cr heat-resistant steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(12): 55-62. DOI: 10.12073/j.hjxb.20240507004
[2]	LI Zhengbing, HU Dean, CHEN Yiping, CHENG Donghai, HE Kai, GUO Yile. Effect of Fe particles on the structure and properties of SnBi/Cu joint during aging[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(8): 22-28. DOI: 10.12073/j.hjxb.20200420003
[3]	ZHOU Li, ZHANG Renxiao, SHU Fengyuan, HUANG Yongxian, FENG Jicai. Microstructure and mechanical properties of friction stir welded joint of Q235 steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(3): 80-84. DOI: 10.12073/j.hjxb.2019400076
[4]	QIAO Junnan, ZOU Jianglin, WU Shikai. Effect of natural aging on microstructure and properties of fiber laser-VPTIG hybrid welding of A7N01 aluminum alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(1): 70-74. DOI: 10.12073/j.hjxb.2018390016
[5]	YANG Sijia, YANG Xiaohua. Microstructure and mechanical properties of SnAgCu/Cu solder joint during isothermal aging[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (5): 83-86.
[6]	QI Yanchang, ZHANG Xiaomu, PENG Yun, TIAN Zhiling. Effect of aging temperature on microstructure and properties of deposited metal for type 15-5PH precipitation hardened stainless steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (10): 105-108.
[7]	QIAO Jisen, YU Jiangrui, GOU Ningnian, YUAN Xiaoer. Development of microstructure influence on mechanical properties of fusion welding joints of aluminium alloy 2A12[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2011, (9): 5-8.
[8]	GE Liling, LIU Yang, JING Xiaotian, HUANG Jianxin. Effect of accelerating ageing on microstructure and properties of TLP joint of T91/T23 dissimilar steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (8): 89-92.
[9]	REN Wenchao, GONG Zhengchun, CHANG Tiejun, WANG Chunbin. Microstructure and properties of E911 steel welded joint aged at 650℃ for long-time[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (8): 105-108.
[10]	CHAI Feng, YANG Cai-fu, ZHANG Yong-quan, HANG Su, XU Zhou. Effect of welding thermal cycle on HAZ microstructure and mechanical properties of copper-bearing age-hardening steels[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2006, (10): 109-112.

Cited By

Cited by

Periodical cited type(1)

王志鹏，朱明亮，轩福贞. CrMoV与NiCrMoV异种钢焊接接头的高周疲劳性能及寿命模型. 焊接学报. 2024(07): 67-73 .

本站查看

Other cited types(0)

Get Citation

PDF

XML

Article views (241) PDF downloads (72) Cited by(1)

Turn off MathJax

Article Contents

Abstract

References

Effect of aging time on the microstructure and mechanical properties of the SP2215 steel welded joint