铝/钢等离子弧熔⁃钎焊接头界面电子背散射衍射分析

doi:10.13229/j.cnki.jdxbgxb.20210880

Abstract

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

Di WU,Wen-hua GENG,Hong-mei LI,Da-qian SUN. Electron backscattered diffraction analysis on interface of aluminum/steel joints produced by plasma arc welding⁃brazing[J].Journal of Jilin University(Engineering and Technology Edition), 2023, 53(5): 1331-1337.

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元素	质量分数	元素	质量分数
Si	0.17	Fe	0.21
Mn	0.72	Zn	0.05
Mg	6.25	Ti	0.04
Cu	0.04	Al	Bal

元素	质量分数	元素	质量分数
C	0.18	S	0.010
Mn	3.00	P	0.038
Si	0.16	Fe	Bal

母材	屈服强度 /MPa	抗拉强度 /MPa	伸长率/%
5A06 铝合金	160	350	16
DP1180超高强钢	850	1200	7

参数	数值
焊接电流/A	90
焊接速度/（mm·min^-1）	280
送丝速度/（mm·min^-1）	300
等离子气体流量/（L·min^-1）	2
保护气流量/（L·min^-1）	20
喷嘴与工件距离/mm	3~4

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

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