搅拌摩擦热力耦合条件下Q&amp;P980钢焊核区组织演变规律

武晓燕; 蔺宏涛; 王怡嵩; 江海涛

doi:10.12073/j.hjxb.20220713001

搅拌摩擦热力耦合条件下Q&P980钢焊核区组织演变规律

武晓燕^1,,
蔺宏涛²,
王怡嵩^{1, 3},
江海涛^1, ,

1.
北京科技大学高效轧制与智能制造国家工程研究中心, 北京, 100083
2.
湖南华菱涟源钢铁有限公司, 娄底, 417000
3.
北京赛福斯特技术有限公司, 北京, 101107

详细信息

作者简介:
武晓燕，博士；主要从事金属材料的焊接及数值模拟；Email: wuxiaoyan@ustb.edu.cn

通讯作者:
江海涛，研究员，博士生导师；Email: jianght@ustb.edu.cn

中图分类号: TG 457
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出版历程
- 收稿日期: 2022-07-12
- 网络出版日期: 2023-04-20
- 刊出日期: 2023-06-24

The microstructure evolution in nugget zone of Q&P980 steel joints under the condition of friction stir welding thermal-mechanical couple effects

1.
National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, University of Science and Technology Beijing, Beijing, 100083, China
2.
LYSTEEL Co., Ltd, Hunan, 417000
3.
Beijing FSW Technology Co., Ltd, Beijing, 101107, China

摘要

摘要: 采用搅拌摩擦焊接技术焊接Q&P980钢，研究搅拌摩擦高温和塑性变形综合作用对Q&P980钢焊核区组织演变的影响规律. 结果表明，焊核区的组织演化受峰值温度、剧烈塑性变形和焊后冷却速率多因素协同调控. 焊核区的峰值温度主要由搅拌头的旋转速度控制，旋转速度越大，焊接峰值温度越高；焊后冷却速率主要由搅拌头的焊接速度控制，焊接速度越大，焊后冷却速度越大，材料受到高温塑性变形的影响越小. 当旋转速度控制在400 r/min时，随着焊接速度从50 mm/min增加到400 mm/min，焊核区组织演变规律为马氏体/铁素体/残余奥氏体→马氏体，晶粒尺寸逐渐粗化. 当焊接速度控制在100 mm/min时，随着旋转速度从200 r/min增加到600 r/min，焊核区组织演变规律为马氏体/铁素体/残余奥氏体→马氏体→马氏体/贝氏体，晶粒尺寸逐渐细化.
- Q&P980钢 /
- 焊核区 /
- 焊接工艺参数 /
- 显微组织
Abstract: The friction stir welding technique was used to weld the Q&P980 steel and the microstructure evolution in the nugget zone was investigated under the conditions of high temperature and severe plastic deformation. The results indicated that, the microstructure was determined by the synthetic effects of peak temperature, the severe plastic deformation and cooling rate. The peak temperature was proportional to the rotation speed. The higher the rotation speed, the higher the peak temperature. The cooling rate was determined by the welding speed. The higher the welding speed, the higher cooling rate and thus, the effect of plastic deformation was not obvious. When the rotation speed kept at the level of 400 r/min, the microstructure evolution was from mixed microstructure of martensite/ferrite/retained austenite and finally evolved into martensite with the welding speed from 50 mm/min to 400 mm/min. The grain size was coarsened correspondingly. When the welding speed was 100 mm/min, the microstructure evolution sequence was changed from martensite/ferrite/retained austesite to matensite, then changed into martensite/bainite. And the grain size was fined correspondingly.
- Q&P980 steel /
- nugget zone /
- welding parameter /
- microstructure

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图 1 焊接过程示意图和搅拌头示意图

Figure 1. The schematic presentation of welding process and stir tool. (a) welding process; (b) stir tool

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图 2 取样示意图(mm)

Figure 2. The schematic presentation of samples

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图 3 Q&P980钢搅拌摩擦焊接接头宏观形貌

Figure 3. The macro morphology of FSWed Q&P980 steel joints

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图 4 焊接接头弧纹特征

Figure 4. Arc pattern characteristics of welded joints

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图 5 不同旋转速度下Q&P980钢FSW接头焊核区中心的微观组织

Figure 5. The microstructures of Q&P980 steel and weld nugget under different rotation speed. (a) BM; (b) 200 r/min; (c) 300 r/min; (d) 400 r/min; (e) 600 r/min

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图 6 不同旋转速度下Q&P980钢FSW接头焊核区微观组织的IPF图

Figure 6. The IPF images of nugget zone of FSWed Q&P980 steel joints under different rotation speed. (a) BM; (b) 200 r/min; (c) 300 r/min; (d) 400 r/min; (e) 600 r/min

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图 7 不同旋转速度下Q&P980钢FSW接头焊核区微观组织的KAM图

Figure 7. The KAM images of nugget zone of FSWed Q&P980 steel joints under different rotation speed. (a) BM; (b) 200 r/min; (c) 300 r/min; (d) 400 r/min; (e) 600 r/min

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图 8 不同旋转速度下焊核区的X射线衍射图谱

Figure 8. XRD of weld nugget at different rotation speed

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图 9 不同焊接速度下接头焊核区中心的微观组织

Figure 9. The microstructures of weld nugget of Q&P980 steel under different welding speed. (a) 50 mm/min; (b) 100 mm/min; (c) 200 mm/min; (d) 300 mm/min; (e) 400 mm/min

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图 10 不同焊接速度下Q&P980钢FSW接头焊核区微观组织的IPF图

Figure 10. The IPF of weld nugget of Q&P980 steel under different rotation speed. (a) 50 mm/min; (b) 100 mm/min; (c) 200 mm/min; (d) 400 mm/min

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图 11 不同焊接速度下Q&P980钢FSW接头焊核区微观组织的KAM图

Figure 11. The KAM of weld nugget of Q&P980 steel under different rotation speed. (a) 50 mm/min; (b) 100 mm/min; (c) 200 mm/min; (d) 400 mm/min

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图 12 不同焊接速度下焊核区的X射线衍射图谱

Figure 12. The XRD of weld nugget at different rotation speed

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表 1 Q&P980钢的主要化学成分(质量分数，%)

Table 1 The composition of Q&P980 steel

C Si Mn P S Cr Ni Fe

0.23 1.43 2.05 0.016 0.004 5 0.045 0.017 余量

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