Ɔhyew ayaresa nhwehwɛmu ne ano aduru a ɛyɛ ductile cast iron .

Wɔ dade ductile dade a ɛyɛ mmerɛw a wɔde hyɛ mu ma ɛporɔw nipadua a ɛwɔ carbonizing no mu ma ɛbɛyɛ graphite a ɛyɛ flocculent akyi no, atirimpɔw a ɛwɔ ɔhyew a wɔde yɛ dade a wɔde yɛ adwuma no mu no wɔ afã abien: biako ne sɛ wɔbɛsakra matrix nhyehyɛe no, ama dade a wɔde ayɛ no atu mpɔn no, ɔfoforo no ne sɛ wobeyi nhyɛso a wɔde gu mu no afi hɔ. Ɛfata sɛ yɛhyɛ no nsow sɛ ɔhyew a wɔde yɛ casting no ntumi nsakra mfitiase graphite nsusuwii ne casting no kyekyɛ, kyerɛ sɛ, mfitiase graphite ɔhyew a wɔde yɛ krataa anaa kurukuruwa no da so ara yɛ krataa anaa kurukuruwa, bere koro no ara mu no, ne kɛse rensakra, rensakra.
1. Ductile cast dade a ɛyɛ onyin .
Wɔ casting mu no, dade a wɔde gu mu no a ɛma onwini no yɛ soronko wɔ ne soro kosi mu, na ɛyɛ casting no mu nhyɛso. Sɛ wɔannyi amfi hɔ a, ɛbɛma afã horow no ayɛ mmerɛw anaasɛ mpo apaapae wɔ ɔkwan a wɔfa so twa ne nea wɔde di dwuma no mu. Nea ɛbɛyɛ na wɔayi adwennwen no afi hɔ no, wɔtaa de onyin a wɔde nsa ayɛ ne onyin a efi awosu mu di dwuma. Fa casting no hyew bɛyɛ 500 ~ 560℃bere pɔtee bi, na afei yi casting no ne fononoo no yɛ nwini. Saa onyin yi yɛ onyin a wɔde nsa ayɛ. Abɔdeɛ mu onyin ne sɛ wɔbɛkora dadeɛ a wɔde ayɛ no abɔnten so asram 6 ~ 18 de ayi adwennwene no adi wɔ abɔdeɛ mu, a ɛbɛtumi agyae adwennwene fã no, nanso wɔmfa nni dwuma ɛnam berɛ tenten ne adwumayɛ a ɛnyɛ yie nti.
2. Ma dade afã horow a wɔde ayɛ adwuma no nyinaa yɛ adwuma yiye wɔ ɔhyew a wɔde yɛ adwuma no ho .
Sɛnea ɛbɛyɛ a dade a wɔde gu mu no nyinaa bɛyɛ adwuma yiye no, mpɛn pii no eyi ano fitaa a ɛma ɛyɛ mmerɛw no fi hɔ, ɛma dade a ɛyɛ den a ɛyɛ den no yɛ den, ɛma ahoɔden a ɛwɔ dade a ɛyɛ den mu no tu mpɔn, dum a wɔde dum, ne nea ɛkeka ho.
(1). ma ahoɔden a ductile iron no wɔ no tu mpɔn denam ignition a ɛyɛ papa so .
Botae a ɛwɔ ductile iron ignition mu ne sɛ ɛbɛdan matrix tissue no ayɛ pearlite ntini a ɛyɛ fɛ. Adeyɛ no ne sɛ wɔbɛsan ayɛ ductile iron casting a ne matrix yɛ ferrite ne pearliite no ayɛ no hyew akodu ɔhyew a ɛyɛ 850-900℃, mfitiase ferrite ne pearlizite no dannan no ma ɛdan austenite, na wɔde graphite a ɛyɛ kurukuruwa bi gu austenite mu. Bere a wɔabɔ ho ban awie no, wɔdannan austenite a mframa ma ɛyɛ nwini no ma ɛdan nhwiren a ɛyɛ fɛ, enti ahoɔden a ɛwɔ casting no mu no yɛ kɛse.
(2). Ma den ductile iron annealing no nyɛ den .
Wɔ casting nhyehyɛe no mu no, dade a ɛyɛ fitaa a ɛyɛ fitaa a ɛyɛ mmerɛw no yɛ fitaa kɛse, na ɛsan nso yɛ emu adwennwen kɛse. Ɛyɛ den sɛ wobenya dade nipadua a ɛho tew anaasɛ pearletic matrix. Sɛnea ɛbɛyɛ a dade a wɔde gu mu no tumi yɛ adwuma yiye anaasɛ ɛyɛ den no, wɔtaa san yɛ dade a wɔde gu mu no hyew ma ɛyɛ digrii 900-950 na wɔde bere a ɛfata ma no ma ɛyɛ hyew kɛse, na afei wɔma fononoo no yɛ nwini kodu digrii 600 ma ɛyɛ nwini. Wɔ adeyɛ no mu no, carburite a ɛwɔ matrix no mu no porɔw graphite no, na graphite no fi austenite no mu ba. Saa graphite yi boaboa ano twa mfitiase kurukuruwa graphite no ho hyia, na matrix no dannan no koraa ma ɛdan ferrite.
Sɛ cast tissue no yɛ (ferrite + pearlite) matrix ne spherical graphite a, sɛnea ɛbɛyɛ a ɛbɛyɛ den sɛ ɛbɛyɛ den no, nea ehia ara ne sɛ yɛbɛpopa nipadua a wɔde carburized no ayɛ wɔ pearlite no mu na yɛadan no ferrite ne spherical graphite. Esiane eyi nti, wɔsan de dade a wɔde gu mu no yɛ hyew kodu coprecipitation hyew a ɛyɛ 700-760℃na fononoo no yɛ nwini kodu 600℃na ɛyɛ nwini.
(3). Isothermal quenching ayaresa a wɔde yɛ dade a wɔde ayɛ aduru a wɔfrɛ no ductile cast .
Botaeɛ a ɛwɔ isothermal quenching treatment of ductile iron ne sɛ ɛbɛdane matrix tissue a ɛwɔ dadeɛ a wɔde gu mu no ayɛ no bainite ntini a ɛyɛ den, ahoɔden anohyetoɔ no tumi boro 1100MPa, ne impact toughness AK 32J. Ayaresa no ne sɛ: bere a wɔayɛ ductile dade a wɔde gu mu no hyew awie no ma ayɛ 830-870℃temperature insulation substrate austenite, de 280-350 degrees molten salt ma, sɛnea ɛbɛyɛ a austenite fã no bɛdan Beskite a ɛba fam, na mfitiase kurukuruwa graphite no nkae a ɛnsakra. Nya dade a ɛyɛ den a ɛwɔ ductile cast mu.
Ɔhyew a wɔde yɛ dade a wɔde ayɛ ade a ɛwɔ atifi hɔ no kyerɛ sɛ ɔhyew a wɔde yɛ dade a wɔde ayɛ aduru no betumi asakra matrix nhyehyɛe no nkutoo, na ɛnyɛ graphite no nsusuwii .