稀土Pr对800 MPa级高强钢焊接熔敷金属组织和性能的影响

石雨龙; 张天理; 方乃文; 王伟光; 刘淇; 李伟; 马青军; 信国松

doi:10.7512/j.issn.1001-2303.2026.08.08

高强钢优质高效焊接 | 浏览量 : 0 下载量: 18 CSCD: 0

PDF
导出
分享
收藏
专辑

稀土Pr对800 MPa级高强钢焊接熔敷金属组织和性能的影响
Influence of Rare Earth Pr on Microstructure and Properties of Weld Deposited Metal of 800 MPa Grade High-Strength Steel
2026年56卷第8期页码：80-88
收稿：2026-07-01，

修回：2026-08-05，

纸质出版：2026-08-20
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

ZHANG T L ， LI Z X ， YOUNG F ， et al . Global progress on welding consumables for HSLA steel ［J］. ISIJ International ， 2014 ， 54 （ 7 ）： 1472 - 1484 .

LIU C ， BHOLE S D . Challenges and developments in pipeline weldability and mechanical properties ［J］. Science & Technology of Welding & Joining ， 2013 ， 18 （ 2 ）： 169 - 181 .

LIU Y ， LI G Q ， WAN X L ， et al . Toughness improvement by Zr addition in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels ［J］. Ironmaking & Steelmaking ， 2017 ， 46 （ 2 ）： 1 - 11 .

HUANG G ， WAN X L ， WU K ， et al . Effects of small Ni addition on the microstructure and toughness of coarse-grained heat-affected zone of high-strength low-alloy steel ［J］. Metals ， 2018 ， 8 （ 9 ）： 1 - 12 .

WAN X L ， WU K M ， HUANG G ， et al . Toughness improvement by Cu addition in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels ［J］. Science & Technology of Welding & Joining ， 2016 ， 21 （ 4 ）： 295 - 302 .

ZHANG M ， WANG Q ， LI J H ， et al . Microstructure numerical simulation of weld pool in rapid solidification ［J］. Transactions of the China Welding Institution ， 2013 ， 34 （ 7 ）： 1 - 4 .

XU L Y ， YANG J ， WANG R Z ， et al . Effect of welding heat input on microstructure and toughness of heated‐affected zone in steel plate with Mg deoxidation ［J］. Steel Research International ， 2017 ， 88 （ 12 ）： 1700157 .

CHAI F ， YANG C S U ， ZHANG H ， et al . Effect of magnesium on inclusion formation in Ti-killed steels and microstructural evolution in welding induced coarse

-grained heat affected zone ［J］. Journal of Iron & Steel Research International ， 2009 （ 1 ）： 69 - 74 .

YU H ， ZHANG T L ， CHEN Y ， et al . Effect of CeO 2 on microstructures and mechanical properties of welded high-strength steel weld metal ［J］. Materials Research Express ， 2021 ， 8 （ 1 ）： 016515 .

ZHANG T L ， GUAN J ， XU L Y ， et al . Influence of Y 2 O 3 on microstructure and properties of 800MPa high-strength steel weld metal ［J］. Science and Technology of Welding and Joining ， 2025 ， 30 （ 1 ）： 78 - 86 .

SONG S H ， SUN H J ， WANG M . Effect of rare earth cerium on brittleness of simulated welding heat-affected zones in a reactor pressure vessel steel ［J］. Journal of Rare Earths ， 2015 ， 33 （ 11 ）： 1204 - 1211 .

CAI Y C ， LIU R P ， WEI Y H ， et al . Influence of Y on microstructures and mechanical properties of high strength steel weld metal ［J］. Materials & Design ， 2014 ， 62 ： 83 - 9 .

WAN X L ， WU K M ， GANG H ， et al . In situ observation of austenite grain growth behavior in the simulated coarse-grained heat-affected zone of Ti-microalloyed steels ［J］. International Journal of Minerals Metallurgy & Materials ， 2014 ， 21 （ 9 ）： 878 - 885 .

WAN X L ， WU K M ， HUANG G ， et al . In situ observations of the formation of fine‐grained mixed microstructures of acicular ferrite and bainite in the simulated coarse‐grained heated‐affected zone ［J］. Steel Research International ， 2014 ， 85 （ 2 ）： 243 - 250 .

GRZYN T ， SZOPA R ， MIROS M . Non-metallic inclusions in the weld metal deposit of shielded electrodes used for welding of low-carbon and low-alloy steel ［J］. Welding International ， 2009 ， 23 （ 1 ）： 54 - 59 .

ZHAO X ， JIANG J ， LI G ， et al . Kinetics of Formation of Large-Dimension Rare Earth Inclusion in Steels ［J ］. Journal of Rare Earths ， 2004 ， 22 （ 3 ）： 403 - 405 .

LI H ， MCLEAN A ， RUTTER J W ， et al . Influence of rare earth metals on the nucleation and solidification behavior of iron and 1045 steel ［J］. Metallurgical Transactions B ， 1988 ， 19 （ 3 ）： 383 - 395 .

MOU H X ， LI X H ， LIU S T . Analysis of Large-Dimension Rare Earth Inclusion in Steels by Metallographic Microscope and TEM ［J］. Applied Mechanics and Materials ， 2012 ， 182-183 ： 288 - 291 .

SONG M ， SONG B ， YANG Z ， et al . Effects of Mn and Al on the Intragranular Acicular Ferrite Formation in Rare Earth Treated C-Mn Steel ［J］. High Temperature Materials & Processes ， 2016 ， 36 （ 7 ）： 683 - 691 .