张婧珂,刘岩,杜安娜,等.焊接速度及芯环比对热成形钢双光斑激光焊接接头组织与性能的影响[J].精密成形工程,2024,16(8):155-164.
ZHANG Jingke,LIU Yan,DU Anna,et al.Effect of Welding Speed and Core Ring Ratio on the Microstructure and Properties of Double Spot Laser Welded Joints of Hot-formed Steel[J].Journal of Netshape Forming Engineering,2024,16(8):155-164. |
| 焊接速度及芯环比对热成形钢双光斑激光焊接接头组织与性能的影响 |
| Effect of Welding Speed and Core Ring Ratio on the Microstructure and Properties of Double Spot Laser Welded Joints of Hot-formed Steel |
| 投稿时间：2024-05-11 |
| DOI：10.3969/j.issn.1674-6457.2024.08.018 |
| 中文关键词: 双光斑激光器 PHS2000热成形钢 显微组织 力学性能 工艺参数 |
| 英文关键词: double spot laser PHS2000 hot-formed steel microstructure mechanical properties process parameters |
| 基金项目:辽宁省自然科学基金计划(2023-MS-320) |
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| 中文摘要: |
| 目的 研究焊接速度和芯环比对PHS2000热成形钢双光斑激光焊接接头组织与性能的影响。方法 使用光学显微镜(OM)、扫描电子显微镜(SEM)等分析了不同参数下焊接接头的组织演变过程，并对焊接接头的抗拉强度和显微硬度进行了测量对比。结果 随着焊接速度的增大，焊缝区(Weld Zone，WZ)平均晶粒尺寸由12.33 μm逐渐减小至10.52 μm。热影响区(Heat Affected Zone，HAZ)平均晶粒尺寸由11.37 μm逐渐减小至9.12 μm。随着芯环比的提高，WZ平均晶粒尺寸由11.13 μm增加至12.62 μm;其中，当芯环比为65%时，HAZ平均晶粒尺寸最小，为9.66 μm。随着焊接速度和芯环比的提高，焊接接头处的抗拉强度大致呈先上升后下降的趋势。当焊接速度为150 mm/min和芯环比为65%时，焊缝区的显微硬度普遍高于其他参数下焊缝区的显微硬度。结论 与芯环比相比，焊接速度对焊接接头组织和力学性能的影响较大;在固定激光功率为4 100 W、离焦量为–2 mm的情况下，当焊接速度为150 mm/min、芯环比为65%时，焊接接头的抗拉强度最优，达到1 715 MPa。 |
| 英文摘要: |
| The work aims to investigate the effect of welding speed and core ring ratio on the microstructure and properties of double spot laser welded joints of PHS2000 hot-formed steel. The microstructure evolution of welded joints under different parameters was analyzed by optical microscopy (OM) and scanning electron microscopy (SEM), and the tensile strength and microhardness of the welded joints were measured and compared. With the increase of welding speed, the average grain size of weld zone (WZ) decreased from 12.33 μm to 10.52 μm, and the average grain size of heat affected zone (HAZ) decreased from 11.37 μm to 9.12 μm. With the increase of the core ring ratio, the average grain size of WZ increased from 11.13 μm to 12.62 μm. The average grain size of HAZ reached the minimum at 9.66 μm when the core ring ratio was 65%. The tensile strength at the welded joints showed a general trend of increasing and then decreasing with increasing welding speed and core ring ratio. At a welding speed of 150 mm/min and a core ring ratio of 65%, the microhardness of the welded joint area was generally higher than that of the welded joint area under other parameters. Compared with the core ring ratio, the welding speed has a greater effect on the microstructure and mechanical properties of the welded joints under the present experimental conditions. Under the condition of fixed laser power of 4 100 W and defocusing amount of –2 mm, the optimum tensile strength of the welded joints is 1 715 MPa when the welding speed is 150 mm/min and the core ring ratio is 65%. |
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