Craft of solder of arc of GH783 alloy argon reachs function

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Summary: Use crisscross sample to be opposite different heat treatment and solder the crackle tendentiousness below combination undertakes assessment, comparative, decided heat treatment and solder assorted plan. Contrasted at the same time HGH718 and HGH738 the contact function of two kinds of welding wire, the result makes clear, HGH718 welding wire is more appropriate at soldering GH783, coefficient of intensity of room temperature of metal of its welding line is amounted to 92% , coefficient of intensity of 650 ℃ high temperature is achieved 96% , have good plasticity and better high temperature endurance at the same time can. Keyword: Preface of function of connect of solder of arc of argon of welding wire of HGH738 of welding wire of GH783 alloy HGH718 is low expand high temperature alloy is material of a kind of when 60 time development rises new-style project, have high strenth, small coefficient of expansion and stable stretch model amount, it is to make outer shroud of casing of turbine burning gas, turbine and the good material that seal Yan Juan, beehive to prop up annulus to wait for high temperature component, can realize active clearance to control a technology, improve the thrust of engine and efficiency effectively, improve the performance of engine. GH783 alloy is new development fight oxidation low expand high temperature alloy, this alloy maintained small coefficient of expansion already, have good stress to quicken crystal boundary oxidation to fight force at the same time (SAGBO) , its 650 ℃ fight oxidisability and Incoloy 718 alloy to comparative, 650 ℃ / 100h oxidation rate is reduced significantly. Accordingly this alloy is in the need high temperature such as outer shroud of turbine engine casing, turbine has competition ability more on the select material of component of 0 space control. But have not be opposite at present its weldability, welder art undertake study. To promote the applied research of this alloy, be badly in need of be being begun to its solder the research of craft. The article undertook assessment to the crackle sensitivity of GH783 alloy, contrasted different solder the contact function of material, received application to provide abecedarian data for the argon arc solder of this alloy. 1 test data and method 1. The GH783 that 1 test data experiments to be developed for proper motion with material is low expand high temperature alloy, δ =3.

0mm, main and chemical composition and sexual visibility express alloy 1, the heat treatment system of material is solid dissolve: 1h of 1120 ℃ × , AC; β effectiveness for a given period of time: 8h of 843 ℃ × , AC; γ ' effectiveness for a given period of time: 8h of 718 ℃ × , with 56 ℃ / of H cold fast fall to 621 ℃ , again 8h of 621 ℃ × , AC. Choose HGH718 and HGH738 welding wire to undertake soldering, comparative the contact function of two kinds of welding wire chooses welding wire with actor. Welding wire is main chemical composition sees a table 2. 1. Surface of the material before solder of 2 experiments method is cleaned via chemistry first, clear via machinery again, use handiwork solder of arc of tungsten pole argon solders. Use HGH718 welding wire to undertake the crack resistance of alloy experiments, at the same time contrast checks HGH718 and HGH738 the contact function of two kinds of welding wire, use lens of report of optical microscope, scanning to observe appearance of form of analytic connect organization, fracture surface. Normal Align=center> watch and function (Wt% ) Normal Align=center>normal Align=center>Cr Normal Align=center>Ni Normal Align=center>Nb Normal Align=center>Ti Normal Align=center>Al Normal Align=center>Fe Normal Align=center>Co Normal Align=center>2.

99 Normal Align=center>28.

82 Normal Align=center>3.

16 Normal Align=center>0.

18 Normal Align=center>5.

52 Normal Align=center>25.

92 Normal LINE-HEIGHT of Center" Align=center> : 18pt; TEXT-ALIGN: B MPa Normal Align=center> σ : 18pt; TEXT-ALIGN: MPa Normal Align=center> σ : 18pt; TEXT-ALIGN: Center" Align=center>1370 Normal Align=center>970 expresses 2 HGH718 and HGH738 bases (Wt% ) Normal Align=center> Normal Align=center>Al Normal Align=center>Fe Normal Align=center>Co Normal Align=center>Cr Normal Align=center>Mo Normal Align=center>Ti Normal Align=center>Ni Normal Align=center>Nb Normal Align=center>HGH718 Normal Align=center>0.

64 Normal LINE-HEIGHT of Exactly" Align=center> : 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: Exactly" Align=center>0.

26 Normal Align=center>18.

37 Normal Align=center>3.

12 Normal Align=center>0.

98 Normal Align=center>52.

44 Normal Align=center>5.

07 Normal Align=center>HGH738 Normal Align=center>1.

44 Normal Align=center>1.

08 Normal Align=center>13.

22 Normal Align=center>19.

80 Normal Align=center>4.

14 Normal Align=center>3.

06 Normal LINE-HEIGHT of Exactly" Align=center> : 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: Exactly" Align=center> , 2 tests result and analysis 2. 1 crack resistance experiments from the watch 1 in the Al content that can see this alloy is very high, and contain a few Ti, basically pass γ , (Ni3Al) precipitation aggrandizement. Accordingly from solder the angle of hot loop action looks, alloy belongs to difficult seam gold, have taller crackle sensitivity. Because this undertook heat treatment combines sensitivity of the crackle below plan differring soldering mixing first,contrast, with coaching later period solders the experiment works. Crack resistance experiment uses crisscross sample, test result sees a picture 1 with the watch 3. From the watch 3 visible and different heat treatment are mixed solder the crack resistance that plan combines differs bigger, solder after solution treatment or complete heat treatment, the crack resistance of alloy is better; Solution treatment, solder hind has complete heat treatment to contact again, solder the crackle of contact expands somewhat; And before solder complete heat treatment, again complete heat treatment is primary to crackle after solder without the influence. Consider the performance of the crack resistance that different position leaves alloy and alloy, connect integratedly, adopt 20min of the solution treatment before solder, the test program of again complete heat treatment after solder. Test result makes clear this processing program to be affected to benefit of base material all without exception. Normal Align=center> pursues 1 model solders crackle Normal Align=center> expresses Normal LINE-HEIGHT of Center" Align=center> plan: 18pt; TEXT-ALIGN: Normal Align=center> crackle: 18pt; TEXT-ALIGN: Center" Align=center>Kl / (% ) Normal > solution treatment + solder Normal Align=center>3.

5 Normal > solution treatment + β effectiveness for a given period of time + solder Normal Align=center>19.

2 Normal > complete heat treatment + solder Normal Align=center>5 Normal > solution treatment + solder + Normal Align=center>6 Normal > solution treatment + β effectiveness for a given period of time + solder + γ ' Normal Align=center>21 Normal > complete heat treatment + solder + Normal Align=center>5 remarks: Complete heat treatment points to solid dissolve + β effectiveness for a given period of time + γ ' effectiveness for a given period of time 2. The classics after solder of 2 connect function is complete heat treatment, yu Gao of purify welding line, the drawing performance that checks welding line and high temperature endurance can, all sample all are broken at welding line. Test result sees a table 4 with the watch 5. Among them 92% what the intensity of welding line room temperature of HGH718 welding wire is base material, 96% what the intensity of 650 ℃ is matrix, have better plasticity at the same time; And 85% what the intensity of welding line room temperature of HGH738 welding wire is base material, 92% what the intensity of 650 ℃ is matrix, plasticity all under HGH718. From the high temperature of welding line metal abiding function also can see, welding wire of HGH738 of excel of HGH718 welding wire. Because this should use HGH718 welding wire,solder GH783 alloy. Normal Align=center> expresses Normal LINE-HEIGHT of brand of Exactly" Align=center> welding wire: 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: Normal Align=center> room temperature: 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: Normal Align=center>650 ℃ : 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: Normal Align=center> tensile strength: 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: B /MPa Normal Align=center> σ : 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: 5 /% Normal Align=center> outspread rate: 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: Normal Align=center> tensile strength: 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: B /MPa Normal Align=center> σ : 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: Normal Align=center> outspread rate: 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: 5 /% Normal Align=center> δ : 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: Exactly" Align=center>HGH718 Normal Align=center>1267 Normal Align=center>3 Normal Align=center>12.

8 Normal Align=center>3 Normal Align=center>935 Normal Align=center>3 Normal Align=center>8.

7 Normal Align=center>3 Normal Align=center>HGH738 Normal Align=center>1170 Normal Align=center>3 Normal Align=center>8.

1 Normal Align=center>3 Normal Align=center>888 Normal Align=center>3 Normal Align=center>7.

2 Normal Align=center>3 remarks: The data in form, the number above shows average, the number below shows sample several. Normal Align=center> watch is abiding function Normal LINE-HEIGHT of brand of Exactly" Align=center> welding wire: 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: Exactly" Align=center> is the biggest stress σ Max/Mpa Normal LINE-HEIGHT of Exactly" Align=center> duration: 18pt; TEXT-ALIGN: Center; Mso-line-height-rule: Exactly" Align=center>t/h: Min Normal Align=center>HGH718 Normal Align=center>630.

5 Normal Align=center>39: 20 Normal Align=center>630.

5 Normal Align=center>45: 50 Normal Align=center>630.

5 Normal Align=center>39: 40 Normal Align=center>630.

5 Normal Align=center>40: 00 Normal Align=center>HGH783 Normal Align=center>596 Normal Align=center>36: 15 Normal Align=center>596 Normal Align=center>36: 00 Normal Align=center>596 Normal Align=center>37: 30 Normal Align=center>630.

5 Normal Align=center>41: 30 note: Initiative stress is 527MPa, every 8h adds stress after 23h 34.

5MPa. 2. Observation of 3 connect organization and fracture surface analysis solder after heat treatment of dissolve of contact classics solid, prescription, the branch brilliant organization of casting condition already diffused. The organization of welding line metallographic of two kinds of welding wire does not have clear distinction (see a picture 2) , grain is bulky, separate out photograph basically distributings along branch brilliant. Graph 3 break appearance of degree of lip-rounding for drawing. From the graph (A) , (B) tear off between brilliant of the branch in the contact edge welding line of visible HGH718 welding wire, nest of the pliable but strong on fracture surface is deeper, and tear off arris apparent, be in tear off arris to see nest of apparent small pliable but strong; And from the graph (C) the fracture surface of visible HGH738 welding wire mixes for plasticity, brittleness rupture, among them major area is fracture surface of shape of nest of pliable but strong, but meantime distributings many brittleness rupture area. By the graph (D) it is thus clear that its brittleness ruptures area fracture surface does not have apparent avulsion arris, however the cleavage with a few different measurement is planar, welding line intensity and plasticity are consequently low. (A) (B) graph 2 connect metallographic organizes (A) (B)(c)(d) pursues Normal Align=center> (A) , (B) , HGH718; (C) , (D) , Normal > (1) GH783 alloy is had taller solder crackle sensitivity, alloy solders below solid dissolve condition have fight best crack ability. Normal > (2) 20min of dissolve of the solid before soldering to be solder with the assorted plan of heat treatment at GH783 alloy aptly, after solder again via complete heat treatment. Normal > (3) the contact strength that uses HGH718 welding wire to solder, plasticity and abiding function all excel HGH738 welding wire. Normal > (4) the formation that still needs pair of crackle the effect matter of function of head of butt joint of composition of mechanism, welding wire makes further thorough research. CNC Milling