01 Daim Ntawv Qhia
Nickel-raws li siab- kub alloys, raws li cov ntaub ntawv siv nyob rau hauv huab ib puag ncig, nthuav qhia complex non-uniform deformation ntawm kub kub vim lub heterogeneity ntawm lub microstructures nyob rau hauv lub fusion zone (FZ), tshav kub- cuam tshuam cheeb tsam (HAZ), thiab cov ntaub ntawv hauv paus (BM) ntawm laser bearing muaj peev xwm{4} thiab cov khoom siv thauj khoom{5} wel lub neej ntawm cov khoom. Cov kev sim tshuaj niaj hnub tawm tsam los ntsuas qhov ntsuas cov khoom siv kho tshuab kom raug thiab tsis tuaj yeem kwv yees qhov siab siab -kub deformation. Txhawm rau hais txog qhov kev sib tw no, txoj kev tshawb fawb no tau siv ntau- ntsuas kev sib koom ua ke ntawm kev sib koom ua ke thiab kev ua qauv, tsom mus rau heterogeneity ntawm micro- thaj chaw thaj chaw hauv laser-welded pob qij txha. Los ntawm kev sib koom ua ke nanoindentation, finite element (FE) simulation, thiab digital image correlation (DIC) testing techniques, a method for predicting non{13}}uniform thermal deformation over the temperature range of 20-800℃was founded.
02 Phau Ntawv Qhia Tag Nrho
Txoj kev tshawb no siv GH3536 npib tsib xee-raws li superalloy ua cov khoom siv sim los ua tus cwj pwm thiab ua qauv ntawm kev coj tus cwj pwm thermal deformation ntawm laser-welded pob qij txha. Los ntawm kev sib koom ua ke nanoindentation, FE simulation thiab DIC xeem cov tswv yim, ua ke nrog cov qauv hardness (Ludwick qauv) thiab dimensionless parameter identification txoj kev, nws soj ntsuam cov micro-cov khoom thiab deformation qauv ntawm FZ, HAZ thiab BM nyob rau hauv qhov kub ntawm 20-800℃. Cov txiaj ntsig kev sim ua kom pom tau tias qhov ntau- nplai txoj kev no tuaj yeem tau txais cov khoom siv tsis zoo ntawm txhua qhov micro- cheeb tsam, nrog rau qhov siab tshaj tawm lub zog yuam kev tsuas yog 9.8% piv rau DIC cov txiaj ntsig kuaj; ntawm 800 degree, qhov tsis yog -uniform deformation sib txawv ntawm 3.0mm wide FZ tensile specimen mus txog 67%. Siv cov qauv no rau lub phaj taub qab thiab T- kev sib tw khoov sib koom ua pov thawj qhov cuam tshuam ntawm cov khoom hauv cheeb tsam ntawm kev ua haujlwm siab - qhov kub thiab txias, piav qhia txog kev sib raug zoo ntawm micro- cheeb tsam cov qauv sib txawv thiab deformation tus cwj pwm. Txoj kev tshawb no elucidates cov txheej txheem tseem ceeb ntawm heterogeneous deformation nyob rau hauv siab -kub alloy welded pob qij txha, hais txog qhov teeb meem ntawm non-uniform deformation uas cov txheej txheem ib txwm tawm tsam los daws, thiab tuav qhov tseem ceeb theoretical thiab engineering tus nqi rau vuam txheej txheem optimization hauv aerospace thiab lwm yam.
Daim duab 03
visually analyses the load-depth (P-h) curves of nanoindentation for BM, HAZ, and FZ of laser-welded GH3536 high-temperature alloy joints from 20℃ to 800℃, revealing that the micro-mechanical properties of the laser-welded GH3536 alloy joints exhibit a gradient distribution of BM>HAZ>FZ, thiab qhov nce ntawm qhov kub thiab txias ua rau qhov kev tsis sib haum xeeb no. Ntawm 500 degree, qhov nkhaus qhia tau hais tias serrated fluctuations sib haum mus rau Portevin-Le Chatelier nyhuv (PLC), ib tug yas instability tshwm sim tshwm sim los ntawm dynamic strain thaum lub sij hawm cov yas deformation ntawm npib tsib xee{3}}raws li siab- kub alloys).
Daim duab 1. P-h curves ntawm indentation xeem nyob rau hauv ntau lub cheeb tsam ntawm txawv kub: (a) 20℃; (b) 300 degree; (c) 500 degree; (d) 800 degree
Daim duab 2 qhia tau hais tias DIC tensile xeem ntawm laser-welded GH3536 siab-kub alloy pob qij txha ntawm 20 degree, qhia tias FZ muaj qhov tsis muaj zog txhua yam khoom, nrog strain ntawm 0.544 ntawm 350 s, ua raws li HAZ, thaum lub BM deforms tshwm sim los ntawm qhov tsawg tshaj plaws, micro- cheeb tsam kev ua tau zoo heterogeneity. DIC xeem nkhaus sib tw rau extensometer nkhaus, lees paub qhov tseeb thiab kev ntseeg siab ntawm DIC cov txheej txheem hauv kev ua kom lub zos deformation ntawm cov pob qij txha.
Figure 3 shows the uniaxial tensile simulation of localised properties in different regions of laser-welded GH3536 high-temperature alloy joints, indicating that the strain distribution consistently follows FZ>HAZ>BM ntawm txhua qhov kub, thiab qhov kub thiab txias ua rau qhov no tsis yog -cov qauv deformation; FE simulation curves zoo sib xws nrog cov kev sim nkhaus, nrog qhov siab tshaj qhov ua yuam kev ntawm lub zog ntawm tsuas yog 9.8%, validating qhov tseeb ntawm nanoindentation inversion ntxiv rau kev hloov kho Ludwick qauv thiab muab kev txhawb nqa txhim khu kev qha rau kev kwv yees siab - qhov kub thiab txias kev ua haujlwm thiab optimizing vuam txheej txheem.
Daim duab 4 nthuav qhia cov duab kos duab ntawm qhov sib npaug ntawm cov yas sib npaug ntawm 20℃rau laser-welded GH3536 siab- kub alloy pob qij txha nrog qhov sib txawv FZ dav. Cov txiaj ntsig tau qhia tias FZ ib txwm yog ib cheeb tsam ntawm kev xav deformation ntawm txhua qhov kub. Ntawm qhov dav FZ ntawm 3.0mm, tsis yog -uniform deformation yog qhov tseem ceeb, nrog rau qhov sib txawv ntawm 68% los ntawm kev sib txawv ntawm 800 degree, thiab qhov sib txawv no nce nrog qhov kub thiab txias. Kev cuam tshuam ntawm FZ dav ntawm deformation uniformity qhia tau hais tias ib qho kev tsis sib xws ntawm thawj qhov nce thiab tom qab ntawd txo qis. Ntawm 1.5mm, deformation tsis yog{14}}uniformity tsis muaj zog vim yog cov khoom siv hauv paus muaj zog, thiab ntawm 4.5mm thiab 6.0mm, nws tsis muaj zog vim muaj kev ntxhov siab redistribution. Nws yog qhov tseeb tias 3.0mm yog qhov dav dav uas yuav tsum zam, muab cov lus qhia tseem ceeb rau kev ua kom zoo dua cov txheej txheem vuam.
