Page 74 - 机械工程材料2024年第十一期
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蔡 军,等:工艺参数对热丝脉冲TIG堆焊Inconel 625合金成形性能及组织的影响



















                                        图 6 3 层 10 道堆焊层搭接界面和堆焊层/基材界面的 SEM 形貌
                   Fig. 6 SEM morphology of overlap interface (a) and cladding layer/base metal interface (b) of three-layer ten-pass cladding layer

                      表2 图6中不同位置的EDS分析结果                        流、低焊接速度可获得窄且高,稀释率低的堆焊层。
                     Table 2 EDS analysis results of different      (2) 低电流条件下堆焊层截面近熔池底部界面
                            positions shown in Fig. 6           的组织以平面晶为主,远离熔池底部的组织以胞状
                                   质量分数/%                       晶、胞状树枝晶为主,近表面的组织以胞状晶和胞状
               位置
                      Fe     Ni    Cr     Mo     Nb     O       树枝晶为主;随着焊接速度的降低,近溶池底部界面
                1    86.55  5.61   3.41   0.47         3.96     的平面晶区范围逐渐扩大,远离熔池底部的胞状晶
                2    72.32  16.55  5.70   1.26         4.16     长度增加,并向柱状晶或胞状树枝晶发展,近表面的
                3    46.95  21.98  22.26  1.97         6.84     晶粒向胞状晶发展。
                4    41.72  22.53  28.58  1.17         6.00         (3)在峰值/基值电流 160 A/95 A、焊接速度
                5     4.81  55.42  19.89  7.23  12.65           240 mm · min  − 1  和搭接率 30%条件下制备的 3 层
                6     8.09  56.44  20.52  7.74   3.73  3.49     10道堆焊层连续、致密且界面无裂纹,显微硬度在
                                                               (280±20)
                                                                          HV,堆焊后需要进行退火处理以降低
                       360                                      硬度。
                       340                                      参考文献:
                       320
                      显微硬度/HV  300                                [1] SANDHU  S  S,SHAHI  A  S.  Metallurgical,
                       280

                       260
                                                                     wear  and  fatigue  performance  of  Inconel  625  weld
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                                         堆焊层   热影响区                  claddings[J]. Journal  of  Materials  Processing
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                          0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8      Technology,2016,233:1-8.
                               距堆焊层表面距离/mm                        [2] CARROLL B E,OTIS R A,BORGONIA J P,et al.

                      图 7 3 层 10 道堆焊试样截面显微硬度分布                       Functionally graded material of 304L stainless steel and
               Fig. 7 Microhardness distribution on cross-section of three-layer   Inconel  625  fabricated  by  directed  energy  deposition:
                             ten-pass cladding sample
                                                                     Characterization  and  thermodynamic  modeling[J]. Acta
                                                                     Materialia,2016,108:46-54.

                                                                  [3] ZHANG  M,ZHU  Z  Y,ZHANG  L  S,et  al.
                                                                     Understanding  microstructure  evolution  and  corrosion
                                                                     behavior of wire arc cladding Inconel 625 superalloy by
                                                                     thermodynamic  approaches[J]. Journal  of  Alloys  and
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                                                                  [4] HE K,DONG L J,WANG Q Y,et al. Comparison on
                                                                     the microstructure and corrosion behavior of Inconel 625
                                                                     cladding deposited by tungsten inert gas and cold metal
                      图 8 3 层 10 道堆焊试样热影响区的显微组织                      transfer  process[J]. Surface  and  Coatings  Technology,
                     Fig. 8 Microstructure of heat affected zone of    2022,435:128245.
                         three-layer ten-pass cladding sample     [5] HUANG J K,LIU S E,YU S R,et al. Cladding Inconel

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