Influence of Rare Earth Pr on Microstructure and Properties of Weld Deposited Metal of 800 MPa Grade High-Strength Steel

SHI Yulong; ZHANG Tianli; FANG Naiwen; WANG Weiguang; LIU Qi; LI Wei; MA Qingjun; XIN Guosong

doi:10.7512/j.issn.1001-2303.2026.08.08

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Influence of Rare Earth Pr on Microstructure and Properties of Weld Deposited Metal of 800 MPa Grade High-Strength Steel
Vol. 56, Issue 8, Pages: 80-88(2026)
Received：01 July 2026，

Revised：2026-08-05，

Published：20 August 2026
DOI： 10.7512/j.issn.1001-2303.2026.08.08
稿件说明：

移动端阅览

石雨龙，张天理，方乃文，等.稀土Pr对800 MPa级高强钢焊接熔敷金属组织和性能的影响［J］.电焊机，2026，56（8）：80-88. DOI： 10.7512/j.issn.1001-2303.2026.08.08.

SHI Yulong, ZHANG Tianli, FANG Naiwen, et al.Influence of Rare Earth Pr on Microstructure and Properties of Weld Deposited Metal of 800 MPa Grade High-Strength Steel[J].Electric Welding Machine, 2026, 56(8): 80-88. DOI： 10.7512/j.issn.1001-2303.2026.08.08.

摘要

以800 MPa级高强钢焊接熔敷金属为研究对象，采用自制金属粉芯焊丝（

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=116739312&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=116739311&type=

2.53999996

2.03200006

1.2 mm）进行多层多道焊，分别制备不含Pr

、含1% Pr

和含2% Pr

熔敷金属试样。利用高温激光扫描共聚焦显微镜对奥氏体、针状铁素体、上贝氏体及马氏体的形成过程进行原位观察，结合SEM-EDS微观组织表征与力学性能测试，研究了稀土Pr

对熔敷金属组织及性能的影响。结果表明：未添加Pr

时，夹杂物在晶界处聚集，奥氏体晶粒平均尺寸为129 μm，上贝氏体体积分数最高达46%，冲击吸收功为45 J；添加1% Pr

后，夹杂物细化并在晶内弥散分布，奥氏体晶粒细化至41 μm，针状铁素体体积分数升至52%，抗拉强度达834 MPa，冲击吸收功提高至72 J；添加2% Pr

后，夹杂物数量减少，上贝氏体和马氏体含量增多，冲击吸收功降低至61 J。研究表明，Pr

的最佳添加量为1%，可为800 MPa级高强钢焊接材料的成分优化提供参考。

Abstract

The effects of rare earth Pr

on the microstructure evolution and mechanical properties of weld deposited metal for 800 MPa grade high-strength steel were investigated. Multi-layer and multi-pass welding was performed using self-developed metal-cored wires (1.2 mm in diameter) to fabricate deposited metal specimens with 0%

and 2% Pr

additions. In-situ observations of the formation behaviors of austenite

acicular ferrite

upper bainite

and martensite were conducted via a high-temperature laser scanning confocal microscope. Combined with SEM-EDS microstructure characterization and mechanical property measurements

the influence mechanism of Pr

on the weld deposited metal was systematically analyzed. The results show that the specimen without Pr

addition exhibits grain-boundary aggregated inclusions

with an average austenite grain size of 129 μm

a maximum upper bainite volume fraction of 46%

and an impact toughness of 45 J. The incorporation of 1% Pr

effectively refines inclusions and enables their intragranular dispersion distribution

while reducing the average austenite grain size to 41 μm. Meanwhile

the volume fraction of acicular ferrite increases to 52%

and the optimized weld deposited metal achieves a tensile strength of 8

34 MPa and an improved impact toughness of 72 J. In contrast

when the Pr

addition increases to 2%

the number of internal inclusions decreases

accompanied by a rise in the content of upper bainite and martensite

which reduces the impact toughness to 61 J. This study demonstrates that 1% is the optimal addition content of Pr

which provides a reliable theoretical and experimental reference for the composition optimization of welding consumables for 800 MPa grade high-strength steel.

关键词

Keywords

references

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