Martensitic bakin karfe yana nufin nau'in bakin karfe wanda microstructure yafi martensite. Abubuwan da ke cikin chromium na bakin karfe na martensitic yana cikin kewayon 12% - 18%, kuma manyan abubuwan haɗin gwiwar sa sune baƙin ƙarfe, chromium, nickel da carbon.
Bakin karfe na Martensitic na iya daidaita kaddarorin injinsa ta hanyar magani mai zafi kuma nau'in bakin karfe ne mai tauri. Martensitic bakin karfe za a iya raba martensitic chromium karfe da martensitic chromium-nickel karfe bisa daban-daban sinadaran abun da ke ciki.
Saurin Ra'ayin Martensitic Bakin Karfe | |
| Kashi | Bakin Karfe |
| Ma'anarsa | Wani nau'i na bakin karfe mai tauri tare da tsarin Martensitic |
| Maganin Zafi | Ragewa, Ragewa, Haushi |
| Alloy Elements | Cr, Ni, C, Mo, V |
| Weldability | Talakawa |
| Magnetic | Matsakaici |
| Micro Structure | Musamman Martensitic |
| Makin Na Musamman | Cr13, 2Cr13, 3Cr13 |
| Aikace-aikace | Ruwan turbine, Kayan tebur, Kayan aikin tiyata, Aerospace, masana'antar ruwa |
Martensitic bakin karfe yana nufin nau'in bakin karfe wanda microstructure yafi martensite. Abubuwan da ke cikin chromium na bakin karfe na martensitic yana cikin kewayon 12% - 18%, kuma manyan abubuwan haɗin gwiwar sa sune baƙin ƙarfe, chromium, nickel da carbon.
Bakin karfe na Martensitic na iya daidaita kaddarorin injinsa ta hanyar magani mai zafi kuma nau'in bakin karfe ne mai tauri. Martensitic bakin karfe za a iya raba martensitic chromium karfe da martensitic chromium-nickel karfe bisa daban-daban sinadaran abun da ke ciki.
1. Martensitic Chromium Karfe
Baya ga chromium, karfen chromium na martensitic shima ya ƙunshi wani adadin carbon. Abubuwan da ke cikin chromium suna ƙayyade juriyar lalata na ƙarfe. Mafi girman abun cikin carbon, mafi girman ƙarfin, taurin da juriya. Tsarin al'ada na wannan nau'in karfe shine martensite, wasu kuma sun ƙunshi ƙaramin adadin austenite, ferrite ko pearlite. An fi amfani dashi don kera sassa, kayan aiki, kayan aiki, wukake, da sauransu waɗanda ke buƙatar ƙarfi da ƙarfi, amma baya buƙatar juriya mai girma. Matsayin ƙarfe na yau da kullun sune 2Crl3, 4Crl3, 9Crl8, da sauransu.
2. Martensitic Chromium-Nickel karfe
Martensitic chromium-nickel karfe ya hada da martensitic hazo hardening bakin karfe, Semi-austenitic hazo hardening bakin karfe da maraging bakin karfe, da dai sauransu, duk wanda high-ƙarfi ko matsananci-high-ƙarfi bakin karfe. Irin wannan ƙarfe yana da ƙarancin abun ciki na carbon (kasa da 0.10%) kuma ya ƙunshi nickel. Wasu maki kuma sun ƙunshi manyan abubuwa kamar molybdenum da jan ƙarfe. Don haka, irin wannan ƙarfe yana da ƙarfi mai ƙarfi, yayin da yake haɗa ƙarfi da ƙarfi da juriya na lalata. Performance, weldability, da dai sauransu sun fi martensitic chromium karfe. Crl7Ni2 shine mafi ƙarancin nickel martensitic bakin karfe da aka fi amfani dashi.
Martensitehazo hardening bakin karfeKarfe yakan ƙunshi Al, Ti, Cu da sauran abubuwa. Yana precipitates Ni3A1, Ni3Ti da sauran watsawa ƙarfafa matakai a kan martensite matrix ta hazo hardening don kara inganta ƙarfin karfe. Semi-austenite (ko Semi-martensitic) hazo hardening bakin karfe, saboda quenched jihar ne har yanzu austenite, don haka quenched jihar iya har yanzu a sanyi aiki, sa'an nan kuma ƙarfafa ta matsakaici jiyya, tsufa magani da sauran matakai. Ta wannan hanya, da austenite a cikin martensitic hazo hardening bakin karfe za a iya kai tsaye canza zuwa martensite bayan quenching, wanda take kaiwa zuwa ga hasarar wahala a cikin m aiki da kafa. Makin karfe da aka fi amfani dasu sune 0Crl7Ni7AI, 0Crl5Ni7M02A1 da sauransu. Irin wannan ƙarfe yana da ɗan ƙaramin ƙarfi, gabaɗaya yana kaiwa 1200-1400 MPa, kuma galibi ana amfani dashi don yin sassa na tsari waɗanda basa buƙatar juriya mai ƙarfi amma suna buƙatar ƙarfi mai ƙarfi.
Maganin zafi da aka saba amfani da shi don bakin karfe na martensitic shine quenching da jin zafi. Yawancin lokaci zaɓi yin sanyi a cikin mai ko iska a zazzabi na 950-1050 ℃. Sa'an nan kuma zafi a 650-750 ° C. Gabaɗaya, yakamata a huce shi nan da nan bayan ya mutu domin a hana simintin tsagewa saboda damuwan da aka kashe.
High-ƙarfi low-carbon martensitic bakin karfe simintin gyaran kafa dauke da karamin adadin nickel, molybdenum, silicon da sauran alloying abubuwa da kyau m inji Properties, waldi Properties da sa juriya bayan normalizing da tempering. Irin waɗannan simintin gyare-gyaren ana amfani da su sosai a cikin simintin gyare-gyare da simintin gyare-gyare + da abubuwan walda na manyan injin turbin ruwa. A wannan yanayin, da zafi magani bayani dalla-dalla yawanci zaba ne normalizing a 950 - 1050 ℃ da tempering a 600 -670 ℃.
Lokacin aikawa: Agusta-17-2021