Effect of Heat Input on the Microstructure of Laser Welded TB9 Joint

FENG Jingru; LIU Dong; ZHANG Kezhao; ZHAO Zixuan; FU Qiang; YAN Chunyan; CHENG Jiangbo; BAO Yefeng

doi:10.7512/j.issn.1001-2303.2025.05.17

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Effect of Heat Input on the Microstructure of Laser Welded TB9 Joint
Vol. 55, Issue 5, Pages: 121-128(2025)
Received：11 January 2025，

Revised：2025-03-06，

Published：20 May 2025
DOI： 10.7512/j.issn.1001-2303.2025.05.17
稿件说明：

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冯静茹，刘栋，张可召，等.热输入对TB9钛合金激光焊接接头显微组织的影响［J］.电焊机，2025，55（5）：121-128. DOI： 10.7512/j.issn.1001-2303.2025.05.17.

FENG Jingru, LIU Dong, ZHANG Kezhao, et al.Effect of Heat Input on the Microstructure of Laser Welded TB9 Joint[J].Electric Welding Machine, 2025, 55(5): 121-128. DOI： 10.7512/j.issn.1001-2303.2025.05.17.

摘要

采用激光焊接工艺制备了TB9激光焊接接头，研究了焊接热输入对接头显微组织的影响规律，并通过数值模拟方法阐述了热输入-热循环-显微组织演变的关系。对于焊缝区，由于TB9合金本身较高的钼当量以及激光焊接的高冷却速率，导致焊缝区高温生成的β相能够稳定至室温，使得焊缝区由单一β相构成。随着焊接热输入的增加，焊缝的物相构成不发生改

变，仍由单一β相构成，但β相晶粒长大，同时由于焊缝中心区域温度梯度降低，会促进β相等轴晶的形成。随热输入的增加，焊缝宏观形貌发生改变，由T形变为X形，焊缝区宽度增加。对于热影响区，由于受到的焊接热作用不同，显微组织呈现出明显的梯度过渡形貌，从熔合线至母材，依次为单一β相区、β+α

（初生α）相区、β+α

+α

（次生α）相区。热输入增加，会使热影响区中的单一β相区增大。

Abstract

TB9 laser welded joints were fabricated utilizing the laser welding process. This study examined the impact of heat input on the microstructure of the joints and explained the interrelationship among heat input

thermal cycles

and microstructural evolution through numerical simulation. The high Mo equivalent of TB9 alloy

together with the high cooling rate of laser welding process

enables the β phase formed at high temperatures to be stabilized to room temperature in the fusion zone. As a result

the fusion zone consists of single β phase. As the heat input increases

the phase composition of the fusion zone remains unchanged

consistently exhibiting a microstructure of single β phase. However

the grain size of the β phase grows. Additionally

the reduction in the temperature gradient within the central region of the fusion zone promotes the formation of equiaxed β phase grains. With the increase of heat input

the macroscopic morphology of the fusion zone transitions from T-shaped to X-shaped

accompanied by a significant increase in the width of the fusion zone. In the heat affected zone

the microstructure exhibits gradient transition morphology from the fusion line to the base metal. The heat affected zone is divided into single β phase region

β+α

(primary α) phase region

and β+α

+α

(secondary α) phase region in order. An increase in heat input correlates with an expansion of the single β phase region in the heat affected zone.

关键词

Keywords

references

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