Study on the Microstructures and Properties of TIP TIG Joints of Ultra-Supercritical Unit G115 Heat-resistant Steel Pipe

SHENG Meifang; LIU Peng; GUO Xinfang; YANG Liubo

doi:10.7512/j.issn.1001-2303.2025.06.21

Smart Electric Power Welding | Views : 0 下载量: 0 CSCD: 0

PDF
Export
Share
Collection
Album

Study on the Microstructures and Properties of TIP TIG Joints of Ultra-Supercritical Unit G115 Heat-resistant Steel Pipe
Vol. 55, Issue 6, Pages: 155-162(2025)
Received：22 September 2024，

Revised：16 October 2024，

Published：20 June 2025
DOI： 10.7512/j.issn.1001-2303.2025.06.21
稿件说明：

移动端阅览

盛美芳，刘鹏，郭新芳，等.超超临界机组G115耐热钢管TIP TIG接头组织与性能研究［J］.电焊机，2025，55（6）：155-162. DOI： 10.7512/j.issn.1001-2303.2025.06.21.

SHENG Meifang, LIU Peng, GUO Xinfang, et al.Study on the Microstructures and Properties of TIP TIG Joints of Ultra-Supercritical Unit G115 Heat-resistant Steel Pipe[J].Electric Welding Machine, 2025, 55(6): 155-162. DOI： 10.7512/j.issn.1001-2303.2025.06.21.

摘要

采用TIG打底+TIP TIG焊对电站锅炉

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=83959028&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=83958997&type=

2.53999996

2.03200006

530 mm×115 mm的G115钢管进行连接，并进行770 ℃高温回火热处理，利用金相、硬度、冲击及电化学腐蚀等试验手段对接头显微组织与力学性能进行分析。研究表明，焊缝区主要由马氏体及少量铁素体组成，组织以等轴晶和柱状晶为主；热影响区以板条马氏体及部分原奥氏体组织为主；母材呈现针片状马氏体形态。接头硬度呈现先下降后升高的趋势，母材处最低（210.5 HV

0.2

），热影响区略高于母材区，熔合区硬度先降低再逐渐升高，焊缝区硬度最高约为281.3 HV

0.2

。冲击韧性则表现出相反趋势，热影响区冲击吸收功达103.09 J，显著优于焊缝区的59.37 J，但两者均满足工程要求。电化学腐蚀试验揭示母材耐腐蚀性最优，焊缝区因高硬度马氏体组织导致耐蚀性下降。研究表明，TIP TIG焊接工艺可实现G115耐热钢管的高质量连接，但焊缝区高硬度与低韧性特征需通过工艺优化（如热输入调控或合金成分设计）进一步改善，以提升接头综合服役性能。

Abstract

The TIG backing + TIP TIG welding method was used to connect G115 steel pipes of Φ530×115mm in power plant boilers

and a high-temperature tempering treatment was carried out at 770 ℃. The microstructure and mechanical properties of the joint were analyzed using metallographic

hardness

impact

and electrochemical corrosion testing methods. The research shows that the weld bead area is mainly composed of martensite and a small amount of ferrite

with the structure being mainly equiaxed and columnar crystals; the heat-affected zone is mainly composed of plate martensite and some original austenite structures; the parent material presents a needle-like martensite morphology. The hardness of the joint shows a trend of first decreasing and then increasing

with the lowest at the parent material (210.5 HV

0.2

)

the heat-affected zone slightly higher than the parent material zone

the hardness of the fusion zone first decreasing and then gradually increasing

and the highest hardness in the weld bead zone being about 281.3 HV

0.2

. The impact toughness shows the opposite trend

with the impact absorption work of the heat-affected zone reaching 103.09 J

significantly bette

r than the 59.37 J of the weld bead zone

but both meet engineering requirements. Electrochemical corrosion tests reveal that the parent material has the best corrosion resistance

while the weld bead area has reduced corrosion resistance due to the high-hardness martensite structure. The research indicates that the TIP TIG welding process can achieve high-quality connections of G115 heat-resistant steel pipes

but the high hardness and low toughness characteristics of the weld bead area need to be further improved through process optimization (such as heat input control or alloy composition design) to enhance the comprehensive service performance of the joint.

关键词

Keywords

references

刘正东，陈正宗，包汉生，等 . 新一代马氏体耐热钢G115研发及工程化［M］. 北京：冶金工业出版社， 2020 .

李其，陈正宗，蒋新亮，等 . 9%~12%Cr高中压转子材料发展历程与工程化关键技术［J］. 钢铁， 2021 ， 56 （ 2 ）： 40 - 49 .

LI Q ， CHEN Z Z ， BAO H S ， et al . Development and engineering manufacture technology of 9%-12% Cr high and medium pressure rotor material ［J］. Iron and Steel ， 2021 ， 56 （ 2 ）： 40 - 49 .

Liu Z ， Liu Z D ， Wang X D ， et al . Investigation of the microstructure and strength in G115 steel with the different concentration of tungsten during creep test ［J］. Materials. Characterization ， 2019 ， 149 ： 95 - 104 .

Dong C ， Liu Z D ， Wang X D ， et al . Formation behavior of long needle-like M23C6 carbides in a nickel based alloy without γ’ phase during long time aging ［J］. Journal of Alloys and Compounds ， 2020 ， 821 ： 153259 .

何焕生，余黎明，刘晨曦，等 . 新一代马氏体耐热钢G115的研究进展［J］. 金属学报， 2022 ， 58 （ 3 ）： 311 - 323 .

HE H S ， YU L M ， LIU C X ， et al . Research progress of a novel martensitic heat-resistant steel G115 ［J］. Acta Metallurgica Sinica ， 2022 ， 58 （ 3 ）： 311 - 323 .

Shang C G ， Zhou Z G ， Wang F ， et al . Evolution of oxide film of a new martensitic steel 9Cr3W3Co in supercritical water ［J］. Corrosion Science ， 2022 ， 209 ： 110771 .

Xiao B ， Xu L Y ， Cayron C ， et al . Solute-dislocation interactions and creep-enhanced Cu precipitation in a novel ferritic-martensitic steel ［J］. Acta Materialia ， 2020 ， 195 ： 199 - 208 .

章亚林，王立玉，王学，等 . 小口径G115新型马氏体耐热钢管接头组织性能分析［J］. 热加工工艺， 2022 ， 53 （ 1 ）： 75 - 78+83 .

ZHANG Y L ， WANG L Y ， WANG X ， et al . Microstructure and mechanical property analysis of small Diameter G115 new martensitic heat resistant steel tube welded joint ［J］. Hot Working Technology ， 2022 ， 53 （ 1 ）： 75 - 78+83 .

仲春生，陈立虎，钱法祥，等 . G115新型耐热钢焊接工艺试验［J］. 焊接技术， 2022 ， 51 （ 10 ）： 54 - 58 .

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 （ 8 ）： 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 （ 8 ）： 1 - 5 .

Cai H Y ， Xu L Y ， Zhao L ， et al . Cold metal transfer plus pulse （CMT+P） welding of G115 steel：Mechanisms， microstructure， and mechanical properties ［J］. Materials Science and Engineering A ， 2022 ， 843 ： 143156 .

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 （ 08 ）： 101 - 107 .

GUO X F ， CUI F Y ， FANG H J ， 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 .

王勇斌 . 厚壁G115耐热钢熔焊接头组织结构与性能研究［D］. 山东：山东建筑大学， 2023 .

Pandey C ， Mahapatra M M ， Kumar P ， et al ， Role of evolving microstructure on the mechanical behaviour of P92 steel welded joint in as-welded and post weld heat treated state ［J］. Journal of Materials Processing and Technology ， 2019 ， 263 ： 241 - 255 .

Alert me when the article has been cited

提交

Critical Review of Laser Additive Manufactured Aluminum Alloys Parts

Effect of Nb on Microstructure and Properties of Laser Cladding Fe-based Coating on EA4T Steel Surface

Study on Microstructure and Properties of TC4 Titanium Alloy Fabricated by Laser Additive Manufacturing and Hot Rolling

Study on the Organization and Properties of Zirconium Alloy Cladding Tubes for Nuclear Power Generation

Study on the Welding Process and Microstructural Properties of 800 MPa-Grade High-Strength Steel for Hydropower Applications Using Laser-Arc Hybrid Welding