1.江阴兴澄特种钢铁有限公司,江阴 214429
2.天津大学材料科学与工程学院,天津 300350
刘观猷(1985—),男,高级工程师;E-mail: cliuguanyou@citicsteel.com
韩永典(1983—),男,博士生导师,教授;E-mail: hanyongdian@tju.edu.cn
收稿:2025-07-29,
修回:2025-09-24,
录用:2025-09-24,
纸质出版:2026-07-30
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刘观猷,葛亮,李良等.焊接工艺对FH420钢疲劳性能的影响[J].特殊钢,2026,47(04):115-122.
Liu Guanyou,Ge Liang,Li Liang,et al.Effect of Welding Process on Fatigue Property of FH420 Steel[J].Special Steel,2026,47(04):115-122.
刘观猷,葛亮,李良等.焊接工艺对FH420钢疲劳性能的影响[J].特殊钢,2026,47(04):115-122. DOI: 10.20057/j.1003-8620.N250509.
Liu Guanyou,Ge Liang,Li Liang,et al.Effect of Welding Process on Fatigue Property of FH420 Steel[J].Special Steel,2026,47(04):115-122. DOI: 10.20057/j.1003-8620.N250509.
试验用80 mm厚FH420钢经过二氧化碳气体保护焊(热输入7 kJ/cm)和单(热输入24 kJ/cm)、双埋弧焊(热输入38 kJ/cm)焊接,形成三种焊接接头,对其1/4厚度处的母材、热影响区和焊缝进行微观形貌观察和硬度测试,并进行不同应力水平下的高周疲劳试验。结果表明,随着热输入的增加,细晶热影响区的珠光体和铁素体尺寸增加,粗晶热影响区的粒状贝氏体含量降低、铁素体含量增加,焊缝区的针状铁素体含量减少、先共析铁素体含量增加,疲劳结果和断口分析表明,三种钢的疲劳性能与焊接热输入引起的组织演变相关性不明显,由于失效位置绝大部分位于母材,三种接头的疲劳S-N曲线接近,较低应力下二氧化碳气体保护焊的未熔合缺陷可能成为疲劳裂纹萌生点,造成接头疲劳性能下降。
The 80 mm-thick FH420 steel used in test was welded by carbon dioxide gas shielded welding ( heat input : 7 kJ / cm ), single ( heat input : 24 kJ / cm ) and double submerged arc welding ( heat input : 38 kJ / cm ) to form three kinds of welded joints. The microstructure morphology observation and hardness test of the base metal, heat affected zone and weld seam at 1 / 4 thickness were carried out, and the high cycle fatigue test under different stress levels was carried out. The results show that with the increase of heat input, the size of pearlite and ferrite in the fine-grained heat-affected zone increases, the content of granular bainite in the coarse-grained heat-affected zone decreases and the content of ferrite increases, the content of acicular ferrite in the weld zone decreases and the content of proeutectoid ferrite increases. The fatigue results and fracture analysis show that the fatigue properties of the three steels are not significantly correlated with the microstructure evolution caused by welding heat input. Since the failure position is mostly located in the base metal, the fatigue S-N curves of the three joints are close. The incomplete fusion defect of carbon dioxide gas shielded welding under lower stress may become the fatigue crack initiation point, resulting in a decrease in the fatigue performance of the joints.
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