白云,孙宪进,刘观猷,等.EH36钢焊接接头疲劳性能研究[J].精密成形工程,2025,17(5):143-151.
BAI Yun,SUN Xianjin,LIU Guanyou,et al.Fatigue Performance of Welded Joints of EH36 Steel[J].Journal of Netshape Forming Engineering,2025,17(5):143-151. |
| EH36钢焊接接头疲劳性能研究 |
| Fatigue Performance of Welded Joints of EH36 Steel |
| 投稿时间：2024-09-24 |
| DOI：10.3969/j.issn.1674-6457.2025.05.016 |
| 中文关键词: EH36 P-S-N曲线 疲劳性能 热输入 焊接接头 疲劳断口 |
| 英文关键词: EH36 P-S-N curve fatigue performance heat input welded joints fatigue fracture |
| 基金项目:国家重点研发计划(2023YFB3709903) |
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| 摘要点击次数: 61 |
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| 中文摘要: |
| 目的 研究不同焊接热输入对不同碳含量的EH36海工钢焊接接头疲劳性能的影响规律以及海工钢焊接接头疲劳的失效机理。方法 采用了热输入为7 kJ/cm的二氧化碳气体保护焊(FCAW)和热输入为50 kJ/cm的埋弧焊(SAW)2种焊接工艺分别对碳含量(质量分数)为0.08%(LC)和0.12%(MC)的80 mm厚EH36钢板的填充层进行焊接，在1/4厚度处截取疲劳试样后分别进行了4种不同材料、不同热输入的交叉疲劳试验和硬度试验，并使用金相显微镜和扫描电镜对组织和疲劳断口进行了表征分析。结果 热输入为7 kJ/cm的LC(LC-7)和MC(MC-7)填充层接头的疲劳极限分别为360 MPa和359 MPa，热输入为50 kJ/cm的LC(LC-50)和MC(MC-50)填充层接头的疲劳极限分别为361 MPa和354 MPa，各试验钢按照390 MPa应力幅下的平均循环寿命由高到低的顺序依次为LC-50、MC-50、LC-7、MC-7。结论 不同焊接热输入、不同碳含量对海工钢的疲劳极限无显著影响，高应力水平下高热输入焊接接头的疲劳性能明显优于低热输入焊接接头的疲劳性能，但在相同热输入条件下，不同碳含量对钢材疲劳性能的影响不显著。所有试样的断口均具有典型的疲劳源区、裂纹扩展区和瞬间断裂区特征。 |
| 英文摘要: |
| The work aims to investigate the influence of different welding heat inputs on the fatigue performance of EH36 marine steel welded joints with varying carbon contents, and to elucidate the fatigue failure mechanism of these joints. In this study, two welding processes (flux-cored arc welding (FCAW) with a heat input of 7 kJ/cm and submerged arc welding (SAW) with a heat input of 50 kJ/cm) were used to weld the filling layers of 80 mm thick EH36 steel plates with carbon contents of 0.08% (LC) and 0.12% (MC), respectively. Fatigue specimens were extracted at one-quarter thickness, followed by cross fatigue tests and hardness tests on the four different materials and heat input conditions. The microstructure and fatigue fracture characteristics were analyzed by metallographic microscopy and scanning electron microscopy. The fatigue limits of the LC (LC-7) and MC (MC-7) welded joints with 7 kJ/cm heat input were 360 MPa and 359 MPa, respectively, while the fatigue limits of LC (LC-50) and MC (MC-50) joints with 50 kJ/cm heat input were 361 MPa and 354 MPa, respectively. The average cyclic life under a stress amplitude of 390 MPa followed the order:LC-50, MC-50, LC-7, MC-7. In conclusion, different welding heat inputs and carbon contents have no significant effect on the fatigue limit of marine steel. However, at high stress levels, welded joints with high heat input exhibit significantly better fatigue performance than those with low heat input. Under the same heat input conditions, the carbon content has no significant effect on the fatigue performance of the steel. The fracture surfaces of all specimens display typical characteristics of a fatigue crack initiation zone, crack propagation zone, and final fracture zone. |
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