Microstructure and Properties Analysis of Welded Joint of P700L/SAPH440-B Dissimilar High Strength Steel

ZHANG Zhe; ZHANG Ming; ZHANG Pengyan

doi:10.7512/j.issn.1001-2303.2025.07.06

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Microstructure and Properties Analysis of Welded Joint of P700L/SAPH440-B Dissimilar High Strength Steel
Vol. 55, Issue 7, Pages: 64-72(2025)
Received：07 July 2024，

Revised：2025-01-02，

Published：20 July 2025
DOI： 10.7512/j.issn.1001-2303.2025.07.06
稿件说明：

移动端阅览

章哲，张明，张朋彦.P700L/SAPH440-B异种高强钢焊接接头组织与性能分析［J］.电焊机，2025，55（7）：64-72. DOI： 10.7512/j.issn.1001-2303.2025.07.06.

ZHANG Zhe, ZHANG Ming, ZHANG Pengyan.Microstructure and Properties Analysis of Welded Joint of P700L/SAPH440-B Dissimilar High Strength Steel[J].Electric Welding Machine, 2025, 55(7): 64-72. DOI： 10.7512/j.issn.1001-2303.2025.07.06.

摘要

异种钢由于化学成分、力学性能等方面的差异，焊接接头容易出现各种质量问题。本研究以P700L/SAPH440-B异种高强钢为对象，使用ER69-G焊丝及二氧化碳保护焊进行焊接，在焊接线能量为7 kJ/cm的条件下得到的焊接接头力学性能优良。使用光学显微镜（OM）观察分析焊缝及两侧热影响区金相组织形貌，对焊缝中诱导针状铁素体的夹杂物采用扫描电镜（SEM）和能谱仪（EDS）进行观察分析，使用冲击试验机、万能试验机、维氏硬度仪检测焊接接头力学性能。试验结果得出，焊缝区域显微组织为针状铁素体和贝氏体，其中针状铁素体占据大部分面积；SAPH440-B侧热影响区和P700L侧热影响区显微组织主要为粒状贝氏体和板条贝氏体，P700L侧热影响区的粒状贝氏体组织更加粗大；焊缝中诱导针状铁素体形核的夹杂物主要是Ti、Al、Si的氧化物，夹杂物周围产生了一定的贫Mn区；焊接接头平均抗拉强度为536 MPa高于两种钢材抗拉强度的平均值517 MPa；焊接接头两侧热影响区存在软化现象，P700L侧热影响区软化现象十分明显且是整个焊接接头硬度值的最低点；焊接接头的特征区域中，P700L侧热影响区平均冲击能量最高，达到88 J，整个焊接接头特征区域的冲击功在母材70%以上，冲击韧性良好；焊接接头面弯与背弯均未出现裂纹。

Abstract

In this experiment

P700L/SAPH440-B dissimilar high-strength steel was used for welding with ER69-G wire and carbon dioxide-shielded welding. Under the condition of welding line energy of 7 kJ/cm

the welded joint has excellent mechanical properties. An optical microscope (OM) was used to observe and analyze the microstructure of the weld and heat-affected zone (HAZ) on both sides

scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to observe and analyze the inclusion of acicular ferrite induced in weld

and impact testing machine

universal testing machine and Vickers hardness tester were used to detect the mechanical properties of welded joints. It is concluded that the microstructure of the weld area is acicular ferrite and bainite

in which acicular ferrite occupies most of the area. The microstructure of the HAZ on the SAPH440-B side and P700L side is mainly granular bainite and lath bainite

while the granular bainite on the P700L side is more coarse. The inclusions inducing acicular ferrite nuclei in the weld are mainly oxides of Ti

and Si

and a certain Mn-poor zone is generated around the inclusions. The average tensile strength of the welded joint is 536 MPa

which is higher than the average tensile strength of the two kinds of steel 517 MPa. There is a softening phenomenon in the HAZ on both sides of the welded joint

and the softening phenomenon in the HAZ on the P700L side is very obvious and is the lowest hardness value of the whole welded joint. In the characteristic region of the welded joint

the average impact energy of the HAZ on the P700L side is the highest

reaching 88J. The average impact energy of the whole characteristic region of the welded joint is more than 70% of the base material

and the impact toughness is good. There were no cracks in the surface bend and back bend of the welded joint.

关键词

Keywords

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