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SAF2205双相不锈钢多层多道焊接头的组织及性能

李亚杰, 刘瑞, 秦凤明, 马承睿

李亚杰, 刘瑞, 秦凤明, 马承睿. SAF2205双相不锈钢多层多道焊接头的组织及性能[J]. 焊接学报, 2023, 44(6): 74-81. DOI: 10.12073/j.hjxb.20220803002
引用本文: 李亚杰, 刘瑞, 秦凤明, 马承睿. SAF2205双相不锈钢多层多道焊接头的组织及性能[J]. 焊接学报, 2023, 44(6): 74-81. DOI: 10.12073/j.hjxb.20220803002
LI Yajie, LIU Rui, QIN Fengming, MA Chengrui. Study on microstructure and comprehensive properties of SAF2205 duplex stainless steel multilayer and multipass welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(6): 74-81. DOI: 10.12073/j.hjxb.20220803002
Citation: LI Yajie, LIU Rui, QIN Fengming, MA Chengrui. Study on microstructure and comprehensive properties of SAF2205 duplex stainless steel multilayer and multipass welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(6): 74-81. DOI: 10.12073/j.hjxb.20220803002

SAF2205双相不锈钢多层多道焊接头的组织及性能

基金项目: 山西省自然科学基金项目(202103021224282和202103021223288)
详细信息
    作者简介:

    李亚杰,博士,副教授;主要从事金属材料先进成形技术/金属增材制造技术;Email: liyajie1207@126.com

    通讯作者:

    秦凤明,博士,副教授;主要从事成型制造技术/金属材料变形组织与性能;Email: qinfengming1014@126.com

  • 中图分类号: TG 457.11

Study on microstructure and comprehensive properties of SAF2205 duplex stainless steel multilayer and multipass welded joint

  • 摘要: 采用TIG/PAW复合焊接对SAF2205双相不锈钢进行多层多道焊接,并进行固溶处理,利用OM、SEM、EBSD等设备,通过电化学腐蚀、拉伸、冲击等试验研究焊缝组织演变与综合性能的关系. 结果表明:TIG填丝盖面焊接处的焊缝铁素体含量为70.5%,由于添加焊丝的原因,焊缝奥氏体晶粒最大为177 μm2,大于母材142 μm2;PAW焊缝铁素体含量为65.4%,因为焊接顺序的不同,后续焊接对焊缝有加热作用,导致铁素体含量最少;在TIG焊缝中,热输入较大,导致铁素体晶粒粗化最大为8 147 μm2,大于母材264 μm2,导致奥氏体形核位置减少,奥氏体仅为3.96%. 在1 050 ℃固溶处理60 min后焊缝两相接近1∶1,并且奥氏体趋于均匀化,随固溶时间的延长耐腐蚀性增强. 焊态焊缝抗拉强度大于846 MPa,拉伸断裂均在母材. 焊缝冲击吸收能量为144 J,小于母材(156 J),焊缝表现为复合断裂.
    Abstract: TIG/PAW composite welding was used to weld SAF2205 duplex stainless steel with three layers and three channels, and solution treatment was carried out. OM, SEM, EBSD and electrochemical corrosion, tensile, impact and other experiments were used to study the relationship between the microstructure evolution of the weld and mechanical properties, corrosion resistance. The results show that the ferrite content of TIG filler wire weld is 70.5%, and the austenite grain of TIG filler wire weld is the largest (177 μm2), which is larger than that of base metal (142 μm2) due to the addition of welding wire. The ferrite content of PAW weld is 65.4%. Due to the different welding sequence, subsequent welding has a heating effect on the weld, resulting in the least ferrite content. In TIG weld, the large heat input results in the coarsening of ferrite grain (8 147 μm2), which is larger than the base metal (264 μm2), resulting in the reduction of austenite core location and only 3.96% austenite. Due to the difference of deformation mechanism and stacking fault energy between austenite and ferrite, the number of ferrite sub-grains is larger than that of austenite, while the number of recrystallized grains and high-angle grain boundary is smaller than that of austenite. After solution treatment at 1 050 ℃ for 60 min, the two phases of the weld are close to 1∶1, and the austenite tends to homogenize, and the corrosion resistance increases with the extension of solution time. The tensile fractures were all in the base metal, and the tensile strength of the weld were greater than 846 MPa. The weld impact energy is 144 J, less than the base metal (156 J), and the weld shows composite fracture.
  • 图  1   SAF2205双相不锈钢焊接示意图(mm)

    Figure  1.   Welding diagram of SAF2205 duplex stainless steel

    图  2   冲击示意图和横向拉伸示意图(mm)

    Figure  2.   Charpy test diagram and transverse tensile diagram. (a) charpy test diagram; (b) transverse tensile diagram

    图  3   SAF2205双相不锈钢母材微观组织

    Figure  3.   Microstructure of SAF2205 duplex stainless steel base material. (a) SEM; (b) EBSD

    图  4   SAF2205双相不锈钢焊缝横截面形貌

    Figure  4.   Cross section morphology of SAF2205 duplex stainless steel weld

    图  5   焊缝局部微观组织特征

    Figure  5.   Microstructure characteristics of the weld. (a) the OM morphologie of TIG filler wire welding seam; (b) the OM morphologie of PAW welding seam; (c) the OM morphologie of TIG welding seam; (d) the IPF diagram of TIG filler wire welding seam; (e) the IPF diagram of PAW welding seam; (f) the IPF diagram of TIG welding seam; (g) the two-phase distribution diagram of TIG filler wire welding seam; (h) the two-phase distribution diagram of PAW welding seam; (i) the two-phase distribution diagram of TIG welding seam

    图  6   SAF2205双相不锈钢1 050 ℃固溶处理后焊缝微观形貌

    Figure  6.   Microstructure of welding seam after solution treatment at 1 050 ℃ of SAF2205 duplex stainless steel. (a) TIG filler wire welding seam after solution treatment for 15 min; (b) PAW welding seam after solution treatment for 15 min; (c) TIG welding seam after solution treatment for 15 min; (d) TIG filler wire welding seam after solution treatment for 30 min; (e) PAW welding seam after solution treatment for 30 min; (f) TIG welding seam after solution treatment for 30 min; (g) TIG filler wire welding seam after solution treatment for 60 min; (h) PAW welding seam after solution treatment for 60 min; (i) TIG welding seam after solution treatment for 60 min

    图  7   SAF2205双相不锈钢在1 mol/L NaCl腐蚀

    Figure  7.   Corrosion of SAF2205 duplex stainless steel in 1 mol/L NaCl. (a) electrochemical polarization curve; (b) electrochemical impedance spectroscop

    图  8   SAF2205双相不锈钢工程应力应变曲线

    Figure  8.   Engineering stress-strain curve of SAF2205 duplex stainless steel

    图  9   拉伸后工件断裂位置

    Figure  9.   Fracture position of workpiece after stretching

    图  10   SAF2205双相不锈钢焊缝与母材冲击断口形貌

    Figure  10.   Impact fracture morphology of SAF2205 dual-phase stainless steel weld and base metal. (a) BM; (b) TIG filler wire weld; (c) PAW (d) TIG

    表  1   SAF2205化学成分(质量分数,%)

    Table  1   Chemical constituents of SAF2205

    CMnSiMoCrNiNSPFe
    0.0160.820.363.1222.485.460.160.0010.024余量
    下载: 导出CSV

    表  2   1 050 ℃固溶处理后焊缝两相比例(γ∶α)

    Table  2   Two-phase ratio of solid solution treated welds at 1 050 ℃

    固溶处理时间t/minTIG + ERPAWTIG
    1530.20∶69.8034.25∶65.2519.02∶80.98
    3038.66∶61.3441.11∶58.5931.75∶68.25
    6047.08∶52.9252.42∶47.5840.98∶59.02
    下载: 导出CSV

    表  3   SAF2205双相不锈钢电化学腐蚀参数

    Table  3   Electrochemical corrosion parameters of SAF2205 duplex stainless steel

    固溶处理时间
    t/min
    腐蚀速度
    vcorr /(g∙m−2∙h−1)
    腐蚀电流
    Icorr /(1 × 10−5 A∙cm2)
    腐蚀电位
    Vcorr /V
    151.015 4622.871−0.1163
    303.045 8714.684−0.1567
    603.658 8074.628−0.1868
    焊态4.794 8879.967−0.2124
    下载: 导出CSV

    表  4   SAF2205双相不锈钢焊缝和母材的拉伸性能

    Table  4   Tensile properties of SAF2205 duplex stainless steel weld and base metal

    固溶处理时间t/min屈服强度ReL/MPa抗拉强度Rm/MPa断后伸长率
    A/(%)
    母材68584644.40
    1563980039.82
    3064480340.44
    6059875840.00
    下载: 导出CSV
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  • 期刊类型引用(1)

    1. 孟美情,韩俭,朱瀚钊,梁哲滔,蔡养川,张欣,田银宝. 基于多丝电弧增材制造研究现状. 材料工程. 2025(05): 46-62 . 百度学术

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出版历程
  • 收稿日期:  2022-08-02
  • 网络出版日期:  2023-04-14
  • 刊出日期:  2023-06-24

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