高强钢金属芯焊丝E120C-K4熔敷金属粗晶区显微组织对冲击韧性的影响

苏小虎; 栗卓新; 李红; JinKim Hee; 孟波

doi:10.12073/j.hjxb.2019400262

高强钢金属芯焊丝E120C-K4熔敷金属粗晶区显微组织对冲击韧性的影响

1.
北京工业大学，北京　100124
2.
韩国工业技术研究院高级熔焊研究组，天安　330-825，韩国
3.
山东聚力焊接材料有限公司，德州　253000

基金项目: 国家自然科学基金资助项目(51574011)；北京市自然科学基金项目（3202002）

详细信息

作者简介:
苏小虎，男，1994年出生，硕士研究生. 主要从事焊接材料方面工作. Email：13241245971@163.com

通讯作者:
栗卓新，男，博士，教授，博士研究生导师. Email：zhxlee@bjut.edu.cn

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出版历程
- 收稿日期: 2018-08-20
- 网络出版日期: 2020-07-12
- 刊出日期: 2019-09-30

Microstructure to properties of coarse grained heat affected zone in deposited weld metal of metal cored wire E120C-K4

1.
Beijing University of Technology, Beijing 100124, China
2.
Advanced Joining Research Team, Korea Institute of Industrial Technology, Cheonan-si 330-825, Korea
3.
Shandong JuLi Welding Co., Ltd., Dezhou 253000, China

摘要

摘要: 采用焊接热模拟通过改变冷却时间(t_8/5)，研究了金属芯焊丝E120C-K4多道焊熔敷金属模拟粗晶区(CGHAZ)显微组织对冲击韧性的影响规律. 结果表明，当t_8/5为6 ~ 12 s时，CGHAZ显微组织由蜕化上贝氏体、粒状贝氏体和针状铁素体组成，奥氏体晶粒内部形成复相分割结构，冲击韧性最好. 而当t_8/5为30 ~ 120 s时CGHAZ显微组织主要由粒状贝氏体和针状铁素体组成，冲击韧性下降. t_8/5为120 s时，冲击韧性最差，–40 ℃冲击吸收能量仅为24 J. t_8/5为6 ~ 12 s时韧性改善的关键是形成复相分割微观结构；晶粒细小；单位距离上大角度晶界数量多.
- 焊接热模拟 /
- 800 ~ 500 °C冷却时间 /
- 粗晶区；显微组织 /
- 冲击韧性
Abstract: The effect of microstructure as a function of welding cooling time (t_8/5) from 800 °C to 500 °C on the impact toughness of coarse grained heat affected zone (CGHAZ) of deposited metal of metal cored wire E120C-K4 was investigated by welding thermal simulation. The results showed that the microstructure of CGHAZ was mainly composed of degenerate upper bainite (DUB) granular bainite (GB) and Acicular ferrite(AF) at t_8/5 from 6 s to 12 s, forming the interlace multiphase microstructure, then the optimal impact toughness was obtained. The microstructure of CGHAZ formed with granular bainite (GB) and Acicular ferrite(AF) and the impact toughness decreased when t_8/5 from 30 s to 120 s. The absorbed energy of CGHAZ was only 24 J at −40 °C at t_8/5 of 120 s, the worst impact toughness. The key of improving impact toughness at t_8/5 from 6 s to 12 s was: ① forming the interlace multiphase microstructure; ② refining grains; ③ more high-angle grain boundaries per unit distance.
- welding thermal simulation /
- 800 °C to 500 °C welding cooling time /
- coarse grained heat affected zone /
- microstructure; impact toughness

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图 1 金属芯焊丝E120C-K4熔敷金属粗晶区组织

Figure 1. OM micrograph of deposited metal in CGHAZ of metal core wire E120C-K

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图 2 不同t_8/5下CGHAZ的冲击吸收能量(–40 ℃)

Figure 2. Impact absorbed energy (–40 ℃) of CGHAZ under different t_8/5

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图 3 t_8/5对模拟粗晶区显微组织的影响(光学组织图)

Figure 3. Influence of t_8/5 to microstructure in simulated CGHAZ (OM micrograph)

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图 4 t_8/5对模拟粗晶区显微组织的影响(扫描组织图)

Figure 4. Influence of t_8/5 to microstructure in simulated CGHAZ(SEM micrograph)

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图 5 t_8/5：6 s下粗晶区的晶体学特征

Figure 5. Crystallographic characteristics at t_8/5: 6 s in CGHAZ

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图 6 t_8/5：12 s下粗晶区的晶体学特征

Figure 6. Crystallographic characteristics at t_8/5: 12 s in CGHAZ

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图 7 t_8/5：30 s下粗晶区的晶体学特征

Figure 7. Crystallographic characteristics at t_8/5: 30 s in CGHAZ

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图 8 t_8/5：60 s下粗晶区的晶体学特征

Figure 8. Crystallographic characteristics at t_8/5: 60 s in CGHAZ

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图 9 t_8/5：120 s下粗晶区的晶体学特征

Figure 9. Crystallographic characteristics at t_8/5: 120 s in CGHAZ

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图 10 不同t_8/5下单位长度晶界数量

Figure 10. Number of grain boundaries per unit length under different t_8/5

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表 1 焊接试验工艺参数

Table 1 Parameters of welding

电流I/A	电压U/V	气体流量Q/(L·mm⁻¹)	保护气体	焊接速度v/(cm·min^–1)	道间温度T/℃	预热温度T/℃	焊丝伸出长度L/mm
200 ~ 220	28 ~ 30	20	10%CO₂ + 90%Ar	28 ~ 30	150 ~ 160	150	16

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表 2 E120C-K4焊丝化学成分(质量分数，%)

Table 2 Chemical composition of E120C-K4 wire

C	Mn	Si	Cr	Mo	Ni	P	S
0.04	1.793	0.597	0.514	0.519	2.226	0.011	0.008 6

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表 3 E120C-K4焊丝力学性能

Table 3 Mechanical properties of E120C-K4 wire

屈服强度 R_e_L/ MPa	抗拉强度 R_m/ MPa	断后伸长率 A(%)	–40 ℃冲击吸收能量 A_kv/ J
815	907	16.3	70

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表 4 粗晶区热模拟参数

Table 4 Thermal simulation parameters for coarse-grained regions

加热速度 ω_H/(℃·s⁻¹)	预热温度 T/℃	峰值温度 T_max/℃	峰值温度停留时间t_H/s	冷却时间 t_8/5/s
150	150	1 350	5	6
150	150	1 350	5	12
150	150	1 350	5	30
150	150	1 350	5	60
150	150	1 350	5	120

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表 5 图5中的晶界角的占比

Table 5 Proportion of boundary angle in Fig 5

冷却时间t_8/5/s	占比w(%)
冷却时间t_8/5/s	2° ~ 10°	10° ~ 30°	30° ~ 180°	10° ~ 180°
6	16.7	15.4	67.9	83.3
12	16.9	18.4	64.7	83.1
30	18.2	16.7	65.1	81.8
60	26.8	14.6	58.6	73.2
120	19.5	14.7	65.8	80.5

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