Imbrittlement of Precision Steel Pipe

Uluhlu lweqondo lobushushu obunqabileyo obusekwe kwityhubhu ezichanekileyo lunokwahlulwa lube lubushushu obuphantsi kunye nobushushu obuphezulu bobushushu obunobushushu obuphantsi.

Emva kokucaphuka brittleness echanekileyo ityhubhu ingxubevange intsimbi yacima martensite kuluhlu lobushushu 250 ~ 400 ℃ obushushu embrittlement intsimbi apho iqondo lobushushu brittle ductile inyuke kakhulu. Yenzeka ikakhulu kwintsimbi yensimbi yealloy kunye ne-low-alloy high power precision tubes. Sele ityhubhu esele i-brittle fracture echanekileyo kukuqhekeka okuphakathi kwegranular okanye i-quasi-cleavage kunye ne-intergranular fracture exutyiweyo. Cause tempering brittleness, ngokubanzi kuqwalaselwa: (1) kunye nesamente ngexesha tempering kwi sheet kwimida yokuqala austenite okuziinkozo, ebangela okuziinkozo embrittlement emdeni zihlobene ngokusondeleyo. (2) izinto zokungacoceki ezifana ne-phosphorus kwi-austenite grain boundary segregation sesinye sezizathu ezibangela ukuba buthathaka. I-Phosphorus engaphantsi kwe-0.005% yeetyhubhu ezichanekileyo zokucoceka okuphezulu azivelisi ukuvutha kobushushu obuphantsi. I-Phosphorus yenzeka kwimida yengqolowa ye-austenite xa ulwahlulo lokufudumala komlilo emva kokucima lugcinwe. Iphosphorus kulwahlulo lomda weenkozo eziziinkozo ze-austenite kunye nesamente ngexesha lobushushu kwimida yangaphambili yeenkozo ze-austenite, ezi zinto zimbini zibangele ukuqhekeka kwe-intergranular brittle fracture, kube negalelo kubushushu oburhabaxa.

Iziqalelo zokudityaniswa kwetyhubhu echanekileyo zinempembelelo enkulu kubushushu obuphantsi obunobushushu obuphantsi. I-Chromium kunye ne-manganese zikhuthaza ucalucalulo lwezinto ezingacocekanga ezifana ne-phosphorus kwimida ye-austenite grain, ngaloo ndlela inegalelo ekucaphukiseni i-brittleness, i-tungsten kunye ne-vanadium ayinasiphumo, i-molybdenum idodobalisa ukuqina kokutshintsha kweqondo lobushushu elibi leetyhubhu ezichanekileyo, kodwa akwanelanga ukuthintela ukucaphuka. . Xa i-silicon inokuthi ibeke elinye ixesha imvula ye-cementite epholileyo, eyenza ukunyuka kwamaqondo obushushu, kunokwenzeka ukuphucula iityhubhu ezichanekileyo zobushushu bobushushu buyenzeke.


Ixesha lokuposa: May-10-2023