I-brittleness ebandayo (okanye i-low-temperature ebrittlement tendency) yeiityhubhu eziqengqelekayo ezibandayongexesha lokusetyenziswa limelwe bukuqina brittleness utshintsho lobushushu Tc.I-Tc yentsimbi ecocekileyo (0.01% C) i--100C, kwaye ngaphantsi kweli qondo lokushisa, liphelele kwi-brittle state.Uninzi lweziqalelo ze-alloyi kwimibhobho yentsimbi echanekileyo eqengqelekayo epholileyo yonyusa ubulukhuni benguqu yobushushu bemibhobho yentsimbi epholileyo eqengqelekayo, inyusa ukutyekela kobuqhophololo obubandayo.Xa i-ductile fracture isenzeka ngaphezu kobushushu begumbi, umphezulu wokuqhekeka kombhobho wentsimbi ococekileyo oqengqelekayo kukuqhekeka okumile okwe-dimple, ngelixa ukuphuka kwe-brittle kwenzeka kubushushu obuphantsi, kukuqhekeka kwe-cleavage.
Isizathu sobushushu obuphantsi be-embrittlement yeetyhubhu eziqaqambileyo eziqengqelekayo kukuba:
(1) Xa i-dislocation eveliswa ngumthombo wokutshatyalaliswa ngexesha lokuguqulwa ivalwe yimiqobo (efana nemida yeenkozo okanye ukulinganisa okwesibini), uxinzelelo lwengingqi ludlula amandla eethiyori zokuchaneka okubandayo okuchanekileyo kwemibhobho yentsimbi ekhanyayo, okubangelwa yi-microcracks.
(2) Ukukhutshwa okuliqela okupakishiweyo kwenza i-microcrack kumda wengqolowa.
(3) Ukusabela ekudibaneni kweebhendi ezimbini ezityibilikayo, ezibangela ukufuduswa okungenakushenxiswa% 26lt;010% 26gt, kunye ne-microcrack emise okwe wedge enokuthi iqhekeze ecaleni kwendiza yokuqhawula.
Izinto ezichaphazela ubuqhophololo obubandayo beetyhubhu eziqaqambileyo eziqengqelekayo ziquka:
(1) Izinto zokuqinisa isisombululo esiluqilima.I-Phosphorus yongeza ukuqina kwenguqu yeqondo lobushushu ngamandla ngakumbi;Kukwakho nemolybdenum, titanium, kunye nevanadium;Xa umxholo uphantsi, umphumo awubalulekanga, ngelixa xa umxholo uphezulu, izinto ezandisa ukuqina kwenguqu yeqondo lokushisa ziquka i-silicon, i-chromium, kunye nobhedu.Izinto ezinciphisa ukuqina kwenguquko yobushushu obuqinileyo ziquka i-nickel, kunye nezinto ezithi zicuthe kuqala kwaye zonyuse ukuqina kwenguquko yobushushu buquka imanganese.
(2) Izinto ezenza isigaba sesibini.Eyona nto ibalulekileyo ekunyuseni i-brittleness ebandayo ye-cold-rolled precision imibhobho yentsimbi eqaqambileyo kunye nesigaba sesibini yikhabhoni.Njengoko umxholo wekhabhoni kwimibhobho yentsimbi ecacileyo epholileyo ebandayo iyanda, umxholo we-pearlite kwimibhobho yentsimbi eqaqambileyo ebandayo iyanda.Ngokwe-avareji, rhoqo nge-1% yokwanda komthamo wepearlite, ukuqina kokutshintsha kobushushu bobushushu bonyuka nge-2.2 ℃ nge-avareji.
(3) Umphumo womxholo wekhabhoni kwi-brittleness kwintsimbi ye-ferritic pearlite.Ukongezwa kwezinto ezincinci ezifana ne-titanium, i-niobium, kunye ne-vanadium iifom ezisasaziweyo ze-nitrides okanye i-carbonitrides, ezibangela ukwanda kobulukhuni benguqu yeqondo lobushushu lemibhobho yentsimbi eqaqambileyo eqengqelekayo.
(4) Ubungakanani benkozo buchaphazela ukuqina kwenguquko yobushushu obuqinileyo, kwaye njengoko iinkozo zirhabaxa, iqondo lobushushu lobulukhuni buyanda.Ukucokisa ubungakanani beenkozo kunciphisa ukutyekela kokuqhaqhazelisa okubandayo kwimibhobho yentsimbi epholileyo eqengqelekayo, eyindlela esetyenziswa ngokubanzi.
Ixesha lokuposa: Sep-01-2023