Inertial friction welding receives GH4169 alloy process organization computation and forecast

1 friction welding receives friction welding of 　 of normative parameter  to receive a process in, can be produced by the condition of solder metal and function a series of change, these change and solder closely related craft parameter. Normally the friction welding of make choice of receives normative parameter to have: N/ of main shaft rotate speed (R · S-1) ; I/ of moment of inertia (Kg · M2) ; Attrition pressure Pf/MPa; Tf /s of  attrition time; Upset presses force Pd/MPa; Upset time Td/s.  1.

The inertial friction welding of 　 of geometrical model  of 2 test specimen receives test specimen to be test specimen tubal account, its diameter is 23mm  , wall thick it is 95mm for 4mm, length. Because be axial symmetry structural member, and face of attrition of seam area edge is symmetrical, reason is in the rectangle of  of 95mm × 4mm is sectional on build finite yuan of model.  1.

The reseau model of 3 test specimen is inside the area that seek solution, differentiate finite yuan reseau sees a picture 1.  uses local district finite yuan reseau adds secret method automatically to improve simulative precision and computational efficiency (the long set side reseau is worth in 0.

1~  changes inside 2mm  limits, classics develop attacks after optimizing, long control arrived by the side of the reseau near attrition face 0.

062mm) , divide into 1888 unit and 4167 node in all. 1.

The alloy of GH4169 of test specimen material that the inertial friction welding of 　 of 　 of material model  of 4 test specimen receives takes the eddy turntable forging from aviation engine directly, its heat up the function that content sex parameter is temperature. Be in finite H, Poisson compares the enthalpy of latent heat of β of coefficient of λ of C of α of coefficient of ρ of density of E of quantity of σ of yuan of stress of flow of data of the definition when numeric imitate, stretch model, material, linear expansion, specific heat capacity, coefficient of thermal conductivity, heat exchange, melt model of μ , shear measures M of G and coefficient of friction etc. 1.

When inertial friction welding accepts the attrib border condition of 5 test specimen, the attrition surface of test specimen is face of material metabolic semmetry, because chafe,go up in this and produce quantity of heat, finite yuan be in when computation heat flux should bring to bear on on the face, define material to flow to be symmetrical face with attrition surface [4, 5]  .  　 assumes attrition pressure is Pf, coefficient of friction is M, main shaft rotate speed is N, attrition thermal efficiency is η , arrive in radius Ri inside the cirque limits of radius Ro it is type by the heat flux that chafe and arises (in 1) , m of coefficient of friction changes along with temperature (obtain by attrition surface condition and concerned data regression) ; N changes along with time (the computation of torque of transient state attrition that goes up by rotate speed of initiative main shaft, moment of inertia and whole attrition face is obtained) .  holds end to bring to bear on in the clip of inertial attrition test specimen distributinging range power, in order to provide attrition pressure and upset pressure. The appearance of inside and outside that providing shape test specimen brings to bear on convection heat exchange is attrib border, the initiative temperature that defines test specimen is room temperature (20 ℃ ) .  1.

6 be out of shape with conduct heat the coupling analysis of the process is in in be out of shape the process is analysed, this compose relation that temperature field passes change data and thermal strain will come true and conduct heat the coupling of the process. In conduct heat in process analysis, be out of shape conduct heat through the change space, attrib border condition and energy are changed will come true and be out of shape the coupling of the process. When  should consider temperature field effect, plasmodium be heated expands and hair heat build-up is out of shape, the thermal strain of isotropy material can state in be type:  is thermal strain heft;  α is linear coefficient of expansion; Δ T  is temperature change quantity; Δ T=T-Tr  , tr is referenced temperature.  is out of shape when the consideration when field action, the heat energy that meet an emergency of plasticity of Lv of the take an examination in the analysis can change with friction work is conducted in heat, namely in type: ω P is the heat source density that plasticity meet an emergency can change;  α P changes efficiency for heat, take  α P=0 normally.

9~0.

95;  of 〗 of σ 〖 TX-*3 is equivalent stress;  ε is rate of equivalent plasticity meet an emergency. In  type:  Qf  is the heat flux that friction work changes;  of  β F is hot distribution coefficient, take  β F=0 normally.

5; The attrition stress between interface of the attrition when  τ F solders for inertial attrition;  Vr is the opposite sliding velocity of attrition interface. 2 recrystallization of   organize  of evolution model  2.

1The 　 of  of dynamic recrystallization process of GH4169 alloy is in inertial solder in the process, as the addition of deformation, by the in-house distortion of solder metal more and more serious, when the distortion degree of material exceeds critical deflection, can produce dynamic recrystallization, the process of dynamic recrystallization is the process of the old grain that by the Xin Jing that does not have distortion bead replaces distortion one gradually. In this process, dynamic recrystallization can refine constituent grain, make material interior organization makes grain of petty and even shape waiting for an axis. After recrystallization phases ends, the grown phenomenon that can produce grain [6, 7] . To GH4169 alloy, compress an experiment to prove via rate of isothermal constant meet an emergency [1]  , the measure with specific some can be brought up immediately after nucleus of form of dynamic recrystallization grain, be in subsequently be out of shape in the process, maintain this measure changeless, afore-mentioned specific measure and primitive grain dimension have nothing to do, basically suffer be out of shape the influence of temperature and rate of meet an emergency.  2.

2Recrystallization calculates GH4169 alloy trends (1) the  of critical meet an emergency of dynamic recrystallization thinks commonly, the C of ε of  of critical meet an emergency that begins dynamic recrystallization and this material stress - existence concerns below between P of ε of  of meet an emergency of the peak value on curve of relation of meet an emergency P  of ε of · of C of β of = of  of C of the ε that it is  , (5) in  type:  of  β C is correction coefficient, it and material are concerned, be in normally 0.

8~0.

9 between.  (2) Xd of recrystallization bulk mark presses the trends of alloy of GH4169 of 　 of computational  　 of mark of dynamic recrystallization bulk S form curve changes, use Avrami equation to describe, namely in type: N is Avrami index;  ε is equivalent meet an emergency;  ε 0.

5 it is the 50% meet an emergency when for mark of dynamic recrystallization bulk.  (3) Dd of  of dimension of grain of 　 of  of computation of dimension of dynamic recrystallization grain heats up figuration to high temperature alloy room temperature and high temperature capability have distinct effect. Reduce a test through rate of isothermal constant meet an emergency, combine the characteristic with the grown grain after recrystallization of GH4169 alloy trends, use next type to describe measure of dynamic recrystallization grain, namely in type:  T  is out of shape for material temperature;  ε is the rate of effect meet an emergency such as material metabolic. 3 finite  of yuan of  of numeric simulative result 3.

　 of  of 1 typical operating mode is mixed through trial test try calculate, make choice of is finite yuan of numeric simulative model operating mode is as follows: Attrition pressure 400  MPa; Upset presses force 400MPa; 1460r/min of rotate speed of  main shaft; Moment of inertia 0.

 of 44983kg · M2 (main shaft) , 0.

62  of 641  Kg · M2 (grail) , 0.

 of 0869kg · M2 (pannikin) ; Weld time depends on computation and decide.  3.

The comparison of the value of temperature actual measurement that  of 2 attrition temperature rise expresses flank of the 1 circle outside be to stand by attrition surface to be in and numeric imitate result. Pass the analysis of pair of computation results, obtain test specimen (DA1-3) receives a process in inertial friction welding in, axial shortens the comparison that estimates numeric imitate result and actual measurement value sees a table 2. 3.

The primitive brilliant granuality of test specimen of imitate of 　 of  of 〗 of ST of 〖 of 〗 of HT of 〖 of 4 recrystallization organization (ASTM) is 8 class, average grain dimension is M of 22  μ , the recrystallization that obtained the heating power after inertial friction welding receives test specimen to affect an area through computation is organized (see a table 3) , actual measurement result sees a picture 2 with the graph 3.  of 4 conclusion  (1) the special case that accepts a process in the light of inertial friction welding, the energy method that article exploration gave to treat condition of dynamic attrition border, be in be out of shape and conduct heat the program of technical divisions reason that an effective established on coupling analysis. Through thinking quite with test result photograph, on numeric simulative foundation, beforehand of buy advocate accuse to solder parameter and real difference can be controlled in 10% less than.  (2) pass finite yuan of numeric imitate method, the distributinging state of stress of the figuration temperature that can obtain inertial attrition weld zone, flow and plasticity meet an emergency, and the metabolic rule of the thermodynamic parameter such as rate of meet an emergency, the dynamic recrystallization equation of the GH4169 alloy that gives out according to the article, can be analysed and forecast solder contact organization and function.  (3) be in finite experiment of yuan of alloy of numeric imitate GH4169 on the foundation, should join the particular case of actual weldment, it is design target with the organization of the area and function combining after solder, analyse inertial friction welding to receive the heating power parameter of the process, optimize solder standard, thereby to solder the automata of the process provides technical support. CNC Milling