|
| QP1180淬火-配分钢激光焊接接头微观组织及力学性能 |
| Microstructure and Mechanical Properties of Laser Welded Joint of QP1180 Quenching-partitioning Steel |
| Received:June 03, 2024 |
| DOI：10.3969/j.issn.1674-6457.2025.02.010 |
| 中文关键词: QP1180淬火-配分钢 激光焊接 工艺参数 微观组织 |
| 英文关键词: QP1180 quenching-partitioning steel laser welding process parameters microstructure |
| 基金项目:先进焊接与连接国家重点实验室开放课题基金(AWJ-23M25);中央引导地方科技专项基金(2019ZYYD023) |
| Author Name | Affiliation | | LI Wenjuan | School of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China | | WANG Jinfeng | School of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China | | SU Wenchao | School of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China | | GUO Yi | School of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China | | CHE Yajun | State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China | | CAI Xiaoyu | State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China | | WANG Hailin | School of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China |
|
| Hits: 18 |
| Download times: 3 |
| 中文摘要: |
| 目的 对QP1180淬火-配分超高强钢的激光焊接工艺进行研究，以获得没有缺陷、能满足汽车零部件使用要求的焊接接头。方法 将1.6 mm厚的QP1180钢板作为母材，对其进行激光焊接，通过改变焊接速度和激光输出功率的方式改变焊接热输入;利用扫描电子显微镜(SEM)、液压拉伸试验机和维氏硬度计等手段，研究热输入对接头宏观成形、界面组织演变规律及接头力学性能的影响。结果 在调整激光焊接工艺参数的条件下，在焊缝表面均未发现明显缺陷，焊缝表面成形良好。随着热输入的增加，QP1180钢激光焊接接头焊缝金属区上下表面以及最窄区域的宽度均有所增加，并且在同样热输入条件下，激光输出功率对焊缝宽度的影响大于焊接速度的影响。母材平均硬度约为375HV，软化区位于亚临界热影响区，软化区宽度随着热输入的增加而变宽。与母材相比，软化区平均硬度下降17HV~52HV，细晶区硬度最高为536HV，较母材硬度大幅增加。在所有能实现焊透的热输入下，工艺参数对焊接接头的强度和塑性影响较小，且均能获得性能良好的焊缝。结论 获得了没有缺陷并能满足汽车零部件使用要求的焊接接头。 |
| 英文摘要: |
| The work aims to study the laser welding process of QP1180 quenched-partitioned ultra-high strength steel to obtain welded joints without defects that can meet the use of automotive parts. A 1.6 mm thick QP1180 steel plate was used as the base metal to carry out laser welding. The welding heat input was changed by changing the welding speed and laser output power. The effects of heat input on the macroscopic forming, interface microstructure evolution and mechanical properties of the joints were studied by means of scanning electron microscopy (SEM), hydraulic tensile testing machine and Vickers hardness tester. Under the condition of adjusting the laser welding process parameters, no obvious defects were found on the weld surface, and the weld surface was well formed. With the increase of heat input, the width of the upper and lower surfaces of the weld metal zone and the narrowest area of the QP1180 steel laser welded joint increased. And under the same heat input condition, the effect of laser output power on the weld width was greater than that of the welding speed. The average hardness of the base metal was about 375HV. The softening zone was located in the subcritical heat affected zone, and the width of the softening zone became wider with the increase of heat input. The average hardness of the softening zone was 17HV-52HV lower than that of the base metal, and the hardness of the fine grain zone was up to 536HV, which was significantly higher than that of the base metal. Under all heat inputs that could achieve penetration, the process parameters had little effect on the strength and plasticity of the welded joint, and the weld with good performance could be obtained. In conclusion, welded joints without defects and meeting the use of automotive parts are obtained. |
|
View Full Text
View/Add Comment Download reader |
| Close |
|
|
|
渝公网安备 50010702501719号