Study of the Microstructure and Properties of Laser Welded Joints of GH3539 Alloy

TIAN Zhi; CHEN Shuangjian; LI Zhuyuan; YANG Xiaoning; WANG Dengxing; YANG Shanglu

doi:10.7512/j.issn.1001-2303.2023.07.01

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Study of the Microstructure and Properties of Laser Welded Joints of GH3539 Alloy
Vol. 53, Issue 7, Pages: 1-8(2023)
DOI： 10.7512/j.issn.1001-2303.2023.07.01

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田志，陈双建，李竹渊，等.GH3539合金激光焊接接头组织及性能的研究［J］.电焊机，2023，53（7）：1-8.

TIAN Zhi, CHEN Shuangjian, LI Zhuyuan, et al.Study of the Microstructure and Properties of Laser Welded Joints of GH3539 Alloy[J].Electric Welding Machine, 2023, 53(7): 1-8.
田志，陈双建，李竹渊，等.GH3539合金激光焊接接头组织及性能的研究［J］.电焊机，2023，53（7）：1-8. DOI： 10.7512/j.issn.1001-2303.2023.07.01.

TIAN Zhi, CHEN Shuangjian, LI Zhuyuan, et al.Study of the Microstructure and Properties of Laser Welded Joints of GH3539 Alloy[J].Electric Welding Machine, 2023, 53(7): 1-8. DOI： 10.7512/j.issn.1001-2303.2023.07.01.

摘要

高温熔盐反应堆（MSR）利用熔融盐作为传热介质，其结构材料需要面对高温、熔盐腐蚀和中子辐照等极端环境，因此对于结构材料的性能要求极为严苛。GH3539合金作为新一代候选结构材料，在极端环境下具有显著的高温机械性能，为推动该合金的焊接应用，采用激光焊接技术对GH3539合金进行焊接，研究了合金激光焊接接头的显微组织、凝固模式及接头力学性能响应。结果表明：GH3539合金激光焊接接头具有较大的深宽比，焊接接头分为母材区、热影响区和熔合区三部分。母材区为奥氏体组织，基体中存在大量的富W碳化物以及少量的富Ti析出相。焊接接头未发现明显的焊接热影响区。熔合区中靠近熔合线的组织类型为平面晶组织，平面晶组织迅速转变为垂直于熔合线方向生长的柱状晶，且具有明显的方向性，柱状晶前沿在焊缝中线处接触，导致部分组织在焊缝中线处不规则，同时在焊缝中心处发现部分等轴晶。力学性能结果显示，熔合区硬度均值为273 HV，硬度值明显高于焊接接头的其他部分，接头中未见明显软化区域。在高温800 ℃时，焊接拉伸试样断裂发生在母材区域，断裂模式为明显的晶间断裂，屈服强度和最大抗拉强度分别为212.6 MPa和295.2 MPa。GH3539合金在高温下依然表现出较好的力学性能。

Abstract

Molten salt reactors (MSR) use molten salt as the heat transfer medium. Their structural materials are exposed to extreme environments such as high temperatures, molten salt corrosion and neutron irradiation. Therefore, the requirement of performance of the structural material is strict. The GH3539 alloy is a new generation of structural materials with significant mechanical properties at high temperatures and in extreme environments. This study on the GH3539 alloy was conducted utilizing laser welding technology to promote the application of this alloy. The microstructure, solidification mode, and mechanical properties of the GH3539 alloy laser-welded joints were investigated. The results indicate that GH3539 laser-welded joints have a high depth-to-width ratio, and that the welded joint is composed of three zones: the base material, the heat-affected zone, and the fusion zone. Typically, the base material zone is austenitic, with a high proportion of W-rich carbide and a minor amount of Ti-rich precipitation phase in the matrix. In the welded joint, there was no significant weld heat affected zone found. The fusion zone near the fusion line is planar crystal. Planar crystal rapidly transformed into columnar crystal. Columnar crystal direction of growth has obvious directional which perpendicular to the fusion line. The front of columnar crystal contacts at the weld center line, resulting in part of the organization at the weld center line disordered. It is also found there are some fine equiaxed crystals at the center of the weld. The average hardness of the weld zone is 273 HV.The microhardness significantly higher than the rest of the joint, and no significant soften area was found. At a high temperature of 800°C, the fracture of the welded tensile specimens occurs in the base material area, and the fracture mode is intergranular fracture, with yield and maximum tensile strengths of 212.6 MPa and 295.2 MPa, respectively. GH3539 alloy still exhibits good mechanical properties at high temperatures.

关键词

GH3539合金激光焊接微观组织硬度高温强度

Keywords

GH3539 alloylaser weldingmicrostructurehardnesselevated temperature tensile strength

references

庄博文，张宪伟，张俊飞，等. 第四代核反应堆用金属材料的研究进展：（一）熔盐反应堆［J］. 阀门， 2023，245（01）： 84-91.

ZHUANG B W， ZHANG X W， ZHANG J F， et al. Research progress on metallic materials for fourth-generation nuclear reactors：（I） molten salt reactors［J］. Valve， 2023，245（01）： 84-91.

吴家杰，王艳丽. 熔盐堆用结构材料的热腐蚀及防护［J］. 中国腐蚀与防护学报， 2022，42（02）： 193-199.

WU J J， WANG Y L. Thermal corrosion and protection of structural materials for molten salt reactors［J］. Chinese Journal of Corrosion and Protection， 2022，42（02）： 193-199.

LIU S， YE X， MING C， et al. An approach to improve the oxidation resistance of a Ni-28W-6Cr alloy by hindering the oxygen vacancy-mediated oxidation［J］. Corrosion Science， 2021，187： 109480.

CHEN S， YE X， TSANG D K L， et al. Welding solidification cracking susceptibility and behavior of a Ni-28W-6Cr alloy［J］. Journal of Materials Science & Technology， 2019，35（01）： 29-35.

岳考捷，贾晨，王云嵩，等. 镍基合金薄板激光焊接研究进展［J］. 光电工程， 2022，49（12）： 26-44.

YUE K J， JIA C， WANG Y S， et al. Advances in laser welding of nickel-based alloy thin plates［J］. Optoelectronic Engineering， 2022，49（12）： 26-44.

刘树林. 基于GH3539合金的800℃熔盐堆用高温合金成分设计［D］. 上海：中国科学院上海应用物理研究所， 2022.

LIU S L. Composition design of high temperature alloys for molten salt stacks at 800°C based on GH3539 alloy［D］. Shanghai：University of Chinese Academy of Sciences （Shanghai Institute of Applied Physics， Chinese Academy of Sciences）， 2022.

丁琪，嵇佳佳，柯文敏，等. 高温合金GH169激光焊工艺研究［J］. 金属加工（热加工）， 2020（12）： 23-26.

DING Q， JI J J， KE W M， et al. Study on laser welding process of high temperature alloy GH169［J］. Metal Processing （Thermal Processing）， 2020（12）： 23-26

郭占英，刘拥军，方海鹏. 热处理对GH4169激光焊接头组织性能的影响［J］. 材料科学与工艺， 2020，28（02）： 60-66.

GUO Z Z， LIU Y J， FANG H P. Effect of heat treatment on the tissue properties of GH4169 laser welded heads［J］. Materials Science and Technology， 2020，28（02）： 60-66.

陈伟民. GH909合金激光焊接接头典型位置微观特征的研究［J］. 电站辅机， 2022，43（02）： 6-9.

CHEN W M. Study on the microscopic characteristics of typical locations of GH909 alloy laser welded joints［J］. Power Station Auxiliary Machinery，2022，43（02）：6-9.

程昊，周炼刚，刘健，等. 热输入对Inconel 617镍基高温合金激光焊接接头显微组织与力学性能的影响［J］. 材料工程， 2023，51（01）： 113-121.

CHENG H， ZHOU L G， LIU J， et al. Effect of heat input on the microstructure and mechanical properties of laser welded joints of Inconel 617 nickel-based high temperature alloy［J］. Materials Engineering， 2023，51（01）： 113-121.

张良，闫飞. GH909合金激光焊接接头的微观组织特征［J］. 中国激光， 2022，49（08）： 40-48.

ZHANG L， YAN F. Microstructural characteristics of laser welded joints of GH909 alloy［J］. China Laser， 2022，49（08）： 40-48.

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