Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (5): 1331-1337.doi: 10.13229/j.cnki.jdxbgxb.20210880

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Electron backscattered diffraction analysis on interface of aluminum/steel joints produced by plasma arc welding⁃brazing

Di WU1,2(),Wen-hua GENG1,3,Hong-mei LI1(),Da-qian SUN1   

  1. 1.College of Materials Science and Engineering,Jilin University,Changchun 130022,China
    2.College of Engineering,Changchun Normal University,Changchun 130031,China
    3.Tianjin Branch FAW-VW Automation Limited Company,Tianjin 301599,China
  • Received:2021-09-07 Online:2023-05-01 Published:2023-05-25
  • Contact: Hong-mei LI E-mail:wdi15@mails.jlu.edu.cn;lihongmei0511@126.com

Abstract:

The technique electron backscatter diffraction was used to investigate the microstructure, grain orientation, grain size and texture of the interface intermetallic compound of aluminum alloy/ultrahigh-strength steel plasma arc welding-brazing joint. The results indicated that the interface zone exhibited an obvious double-layer structure with different sizes and morphologies, which is composed of Fe4Al13 phase and Fe2Al5 phase. The Fe4Al13 phase has fine equiaxed grains morphology and is dominated by high-angle one, while the Fe2Al5 phase has columnar grains morphology and is dominated by low-angle grain boundary. The grain size of Fe4Al13 is obviously smaller than that of Fe2Al5. The main texture of Fe4Al13 phase is <010> silk texture, while the main texture of Fe2Al5 phase is <001> silk texture with obvious preferred orientation.

Key words: metallic materials, aluminum alloy/ultrahigh-strength steel, plasma arc welding-brazing, microstructure of interface, texture, electron backscattered diffraction

CLC Number: 

  • TG456.2

Table 1

Chemical compositions of 5A06 aluminum alloy"

元素质量分数元素质量分数
Si0.17Fe0.21
Mn0.72Zn0.05
Mg6.25Ti0.04
Cu0.04AlBal

Table 2

Chemical compositions of DP1180 ultrahigh-strength steel"

元素质量分数元素质量分数
C0.18S0.010
Mn3.00P0.038
Si0.16FeBal

Table 3

Mechanical properties of 5A06 aluminum alloy and DP1180 ultrahigh-strength steel"

母 材屈服强度 /MPa抗拉强度 /MPa伸长率/%
5A06 铝合金16035016
DP1180超高强钢85012007

Fig.1

Drawing of plasma arc welding"

Table 4

Parameters of plasma arc welding"

参 数数值
焊接电流/A90
焊接速度/(mm·min-1280
送丝速度/(mm·min-1300
等离子气体流量/(L·min-12
保护气流量/(L·min-120
喷嘴与工件距离/mm3~4

Fig.2

Microstructures of interface zone"

Fig.3

EBSD distribution mapping of interface zone"

Fig.4

Grain orientation distribution of interface zone"

Fig.5

Grain boundaries misorientation angle distribution of interface zone"

Fig.6

Grain size distribution of interface zone"

Fig.7

Pole figure maps of interface zone"

Fig.8

Schmidt factor distribution of interface zone"

Fig.9

Schmidt factor statistics of interface zone"

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