Obrada materijala 2.s 2. test
Authored by Ivan Zelenika
Science
2nd Grade
Used 3+ times
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1.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Postupak kaljenja sastoji se od grijanja na temperaturu austenitizacije i progrijavanja, držanja na tempertauri austenitizacije i hlađenja velikom brzinom (većom od kritične)- gašenja
točno
netočno
2.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Čelik se može kaliti samo ako sadrži min. 0,75 % ugljika
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3.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Kaljivost čelika je svojstvo čelika da se gašenjem temperature austenitizacije zakali (postigne tvrdoću na površini) i prokali (postigne tvrdoću po poprečnom presjeku).
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4.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Prokaljivost je svojstvo čelika da se uz određenu brzinu hlađenja postigne što dublji sloj austenita.
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5.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Karakteristika žarenja je lagano hlađenje obratka nakon zagrijavanja te držanja na određenoj temperaturi.
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6.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Postupci žarenja prvog reda kod kojih se postižu promjene svojstava neovisne o strukturnim promjenama su
- rekristalizacijsko žarenje.
- sferoidizacijsko žarenje
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7.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Normalizacijskim žarenjem postiže se jednolična i sitnozrnata struktura na predmetima čija struktura po presjeku nije homogena po veličini kristalnog zrna ili po fazama
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