电焊机2025，Vol.55Issue(5)：121-128,8.DOI:10.7512/j.issn.1001-2303.2025.05.17
热输入对TB9钛合金激光焊接接头显微组织的影响
Effect of Heat Input on the Microstructure of Laser Welded TB9 Joint
摘要
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 micro-structural 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 for-mation of equiaxed β phase grains.With the increase of heat input,the macroscopic morphology of the fusion zone transi-tions 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+αp(primary α)phase region,and β+αp+αs(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
TB9钛合金/激光焊接/热输入/显微组织Key words
TB9 alloy/laser welding/heat input/microstructure分类
矿业与冶金引用本文复制引用
冯静茹,刘栋,张可召,赵梓萱,傅强,严春妍,程江波,包晔峰..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):121-128,8.基金项目
中央高校基本科研业务费专项资金(B220202026) （B220202026）
常州市科技计划(CJ20220074) （CJ20220074）
