TIG+SMAW Process and Properties Analysis of Large Diameter Thick-walled G115 Heat-Resistant Steel Pipe

Xinfang GUO; Fengyou CUI; Hongju FAN; Fuwei WAN; Lanwen CHEN; Peng LIU; Xueyan FENG

doi:10.7512/j.issn.1001-2303.2022.08.14

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TIG+SMAW Process and Properties Analysis of Large Diameter Thick-walled G115 Heat-Resistant Steel Pipe
Vol. 52, Issue 8, Pages: 101-107(2022)
DOI： 10.7512/j.issn.1001-2303.2022.08.14

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郭新芳，崔凤友，范宏举，等.大口径厚壁G115耐热钢管TIG+SMAW工艺及性能分析［J］.电焊机，2022，52（8）：101-107.

GUO Xinfang, CUI Fengyou, FAN Hongju, et al.TIG+SMAW Process and Properties Analysis of Large Diameter Thick-walled G115 Heat-Resistant Steel Pipe[J].Electric Welding Machine, 2022, 52(8): 101-107.
郭新芳，崔凤友，范宏举，等.大口径厚壁G115耐热钢管TIG+SMAW工艺及性能分析［J］.电焊机，2022，52（8）：101-107. DOI： 10.7512/j.issn.1001-2303.2022.08.14.

GUO Xinfang, CUI Fengyou, FAN Hongju, et al.TIG+SMAW Process and Properties Analysis of Large Diameter Thick-walled G115 Heat-Resistant Steel Pipe[J].Electric Welding Machine, 2022, 52(8): 101-107. DOI： 10.7512/j.issn.1001-2303.2022.08.14.

摘要

采用TIG+SMAW方法对超超临界电站锅炉用大口径厚壁G115耐热钢管进行焊接，并对焊接接头不同壁厚位置进行微观组织结构特征及其力学性能分析。结果表明，焊缝区、热影响区及熔合区存在较为明显的组织转变，焊缝区主要由回火马氏体组织组成，热影响区以板条马氏体组织为主，母材呈现片状马氏体组织，且由母材至焊缝，晶粒逐渐细化，焊缝以等轴晶和柱状晶组织为主。从母材到焊缝，接头硬度分布呈现逐渐升高的趋势，但在熔合线附近硬度略有下降，其中热影响区最低，焊缝区硬度最高。接头冲击韧性试验表明，热影响区根部冲击吸收功明显高于焊缝，填充区则略低于焊缝，焊缝区冲击吸收功平均值为43.89 J，热影响区的冲击功平均值为66.49 J，接头冲击韧性较好，能满足实际使用要求。

Abstract

TIG+SMAW method is used to weld large diameter thick-walled G115 heat-resistant steel pipe used for ultra-supercritical power plant boiler, and the microstructure and mechanical properties of the joint are analyzed. The results show that there are obvious microstructural transformation in weld zone (WZ), heat affected zone (HAZ) and fusion zone. The WZ is mainly composed of tempered martensite microstructure, HAZ is mainly composed of lath martensite microstructure, and base metal appears lamellar martensite microstructure. From the base metal to the weld, the grain gradually refines, the microstructure of weld is mainly equiaxed grain and columnar grain, and the joint hardness distribution gradually increases, but slightly decreases near the fusion line, in which the minimum value of joint hardness is 220.6 HV0.2 (HAZ) and the maximum value is 302.8 HV0.2 (WZ). In addition, the joint impact test shows that the impact absorption energy of the root of HAZ is significantly higher than that of the weld, while that of the filled zone is slightly lower than that of the weld. The average values of the impact absorption energy in WZ and HAZ are 43.89 J and 66.49 J respectively. The impact toughness of the welded joint is good, which can meet the actual application requirements.

关键词

G115耐热钢熔化焊大口径厚壁管显微组织力学性能

Keywords

G115 heat-resistant steelarc weldinglarge diameter thick wall pipemicrostructuremechanical properties

references

吴增强，白银，马龙腾，等. 650℃马氏体耐热钢研究及其进展［J］. 钢铁， 2015， 50（5）： 1-6.

Wu Z Q， Bai Y， Ma L T， et al. Research and development of martensitic creep-resistant steels for 650℃［J］. Iron Steel， 2015，50（5）： 1-6.

王敬忠，刘正东，包汉生，等. 中国超超临界电站锅炉关键材料用钢及合金的研究现状［J］. 钢铁， 2015， 50（8）： 1-9.

Wang J Z， Liu Z D， Bao H S， et al. Study of steel and alloys for ultra-supercritical power plant in China［J］. Iron Steel， 2015，50（8）： 1-9.

迟成宇，于鸿垚，谢锡善. 600℃超超临界电站锅炉过热器及再热器管道用先进奥氏体耐热钢的研究与发展［J］. 世界钢铁， 2012， 12（4）： 50-65.

Chi C Y， Yu H Y， Xie X S. Research and development of austenitic heat-resistant steels for 600℃ superheat/reheater tubes of USC power plant boilers［J］. World Iron Steel， 2012， 12（4）： 50-65.

Liu Z， Wang X T， Dong C. Effect of boron on G115 martensitic heat resistant steel during aging at 650 ℃ ［J］. Materials Science and Engineering： A，2020，787： 139529.

Yan Peng， Liu Zhengdong. Hot Deformation Behavior of a New 9%Cr Heat Resistant Steel G115［J］. Journal of Iron and Steel Research （English Edition）， 2013（9）： 73-79.

李海昭，梁军，周超，徐连勇.正火温度G115钢组织及650℃强度的影响［J］. 金属热处理， 2018， 43（2）： 173-177.

Li H Z， Liang J， Zhou C， Xu L. Effect of normalizing temperature on microstructure of G115 steel and strength at 650 °C［J］. Heat Treatment of Metals， 2018，43（2）： 173-177.

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： 539-548.

Liu Z D， Chen Z Z， He X K， 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： 539-548.

李新梅，张晶，杜宝帅，等.USC机组耐热钢P92焊接接头力学性能［J］. 电焊机， 2016， 46（05）： 78-81.

Li X M， Zhang J， Du B S， et al. Mechanical properties of heat-resistance steel P92 welded joint for USC unit［J］. Electric Welding Machine， 2016，46（05）：78-81.

Zhang J， Huang B， Wu Q， et al. Effect of post-weld heat treatment on the mechanical properties of CLAM/316L dissimilar joint［J］. Fusion Engineering & Design， 2015， 100： 334-339.

徐连勇，庞红宁，赵雷，等. G115钢CMT+P焊接工艺及组织和性能［J］.焊接学报，2020， 41（08）： 1-5.

Xu L Y， Pang H N， Zhao L， et al. Microstructure and mechanical properties of CMT+P welding process on G115 steel［J］. Transactions of the China Welding Institution， 2020， 41（08）： 1-5.

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