Sarrafa bakin karfe intergranular lalata, 304 bakin karfe, 304 bakin karfe tsatsa da lalata a cikin bakin karfe intergranular lalata a cikin wasu 10%, zai sa manne da hatsi ya ki, a gaban danniya, musamman sauki crack, ko da crumple. , kuma boye, ganuwa daga siffarsa.Har ila yau, wasu manyan abubuwan da ke haifar da lalata suna jawo shi.Intergranular lalata na austenitic bakin karfe lalacewa ta hanyar talauci ya fi mayar saboda hatsi iyakoki Cr, Cr da c sauki nau'i sinadaran mahadi, da Cr abun ciki.
1, sinadari da tsari
(1) C abun ciki
C abun ciki na karfe sakamakon lalata intergranular na austenitic bakin karfe ne mafi girma factor.A daya hannun, da tsananin sarrafa c da kuma kiyaye carbon abun ciki a tushe karfe da waldi sanda a 0.08%, a kan tushe karfe da waldi abu ƙara stabilizer abubuwa na Ti, Nb, karfi da dangantaka da c, carbon kafin Cr daure, samar da barga. fili.
(2) tsarin tsari biyu
Tsarin lokaci biyu zai ƙara ƙarfin juriya ga lalatawar intergranular.A daya hannun, shiga ferrite kafa abubuwa, kamar chromium, Silicon, aluminum, molybdenum, weld samuwar dual-phase tsarin, a kan zaba ginin wakili dauke da ferrite more waldi kayan.
2, fasahar walda
(1) zafin jiki a cikin 450 ~ 850 ℃ da zafin jiki kewayon, musamman a 650 ° c ne mafi sauƙi generated intergranular lalata hatsarin yanayin zafi yankin (kuma aka sani da zazzabi yankin-m).Bakin karfe waldi, welds za a iya dauka a karkashin laminate, ko kai tsaye a cikin baya ruwa sanyaya na weld, don kwantar da sauri, rage lokaci a cikin zafin jiki kewayon, su ne m matakan inganta lalata juriya na gidajen abinci.
(2) karuwa na waldi line makamashi, zai hanzarta lalata na austenitic bakin karfe.A lokacin aikin walda, tare da ƙarancin halin yanzu, babban saurin waldawa, gajeriyar baka, hanyar waldawa da yawa, da rage zafi.Shigar da ƙarancin zafi, ta hanyar wayar da kan zafin jiki da sauri isa don guje wa lalatawar yankin da zafi ya shafa.
Lokacin aikawa: Maris-12-2018