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)
Received：05 June 2023，

Published：25 July 2023
DOI： 10.7512/j.issn.1001-2303.2023.07.01
稿件说明：

移动端阅览

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

Keywords

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