14.Thep hop kim

*Than fan hoa hoc:la loai thep ma ngoai sat,cacbon va cac tap chat,ng ta co y them vao cac nguyen to dac biet voi mot luog nhat dinh de lam thay doi to chuc va tinh chat of thep cho hop yeu cau ng su dug

*Dac diem of thep hop kim:

_Dat tien

_Co do ben cao hon han so voi thep cacbon

_Cag tag muc do hop kim hoa,tinh cog nghe cag jam

_Tinh chiu nhiet cao

_Co cac tinh chat vat ly va hoa hoc dac biet (ko ri,co tinh jan no...)

*Fan loai thep hop kim

_+_Fan loai theo to chuc te vi

_Fan loai theo to chuc o trag thai can bag:

+Thep trc cug tich voi to chuc ferit va peclit

+Thep cug tich voi to chuc peclit

+Thep sau cug tich voi to chuc peclit va cacbit II

+Thep ledeburit voi to chuc co cug tinh ledeburit

+Thep ostenit voi to chuc thuan ostenit

+Thep ferit voi to chuc thuan ferit

_Fan loai theo to chuc o trag thai thuog hoa:

+Thep peclit

+Thep mactenxit

+Thep ostenit

_+_Fan loai theo nguyen to hop kim:dua vao ten cac nguyen to chinh cua thep

_+_Fan loai theo tog luog cac nguyen to hop kim:

_Thep hop kim thap:tog luog cac nguyen to hop kim

_Thep hop kim trug binh:Tong luog cac nguyen to hop kim tu 2,5-10%

_Thep hop kim cao:tog luog cac nguyen to hop kim >10%

_+_Fan loai theo cog dug:day la cach fo bien nhat:

_Thep can nog

_Thep ket cau

_Thep dug cu

_thep hop kim dac biet

*Anh huog of nguyen to hop kim den cac wa trinh nhiet luyen:

_Cac nguyen to hop kim anh huog manh den cac wa trinh nhiet luyen,dac biet la toi va ram,do do anh huog lon den co tinh

+Chuyen bien khi nug nog de toi

+Su fan hoa dag nhiet of austenite dag nhiet va do tham toi

+Chuyen bien mactenxit

+Chuyen bien khi ram