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MMET 207 Exam 2 - TAMU – Craig| Fall 2024( Questions & Answers)
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MMET 207 Exam 2 - TAMU – Craig| Fall 2024( Questions & Answers)
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MMET 207 Exam 2 - TAMU – Craig| Fall2024( Questions & Answers)
What microstructure does OQT indicate for a hypereutectoid steel? Correct Ans-Martensite
and Cementite
Low carbon steel % Correct Ans-<.3% carbon
Medium carbon steel % Correct Ans-.3%-.6%
High carbon steel % Correct Ans-.6%-2%
Carbon steel definition Correct Ans-An alloy of iron and carbon with carbon below 2%
Corrosion Correct Ans-deterioration of a material or its properties because of reaction with its
environment
problems caused by corrosion Correct Ans-weight gain/reduction, mechanical properties
affected
Factors affecting corrosion (3) Correct Ans-environment
material properties
physical conditions
,Requirements for corrosion to occur Correct Ans-anode (higher energy, active)
cathode (lower energy, passive)
metal path
electrolyte that will carry ions
difference in energy between anode & cathode
8 Basic types of corrosion Correct Ans--uniform
-pitting
-crevice
-galvanic
-stress corrosion cracking
-intergranular attack
-dealloying
-erosion
what is slurry erosion Correct Ans-material removal due to the combined action of corrosion
and wear. The source of the wear and an accelerator of the corrosion is abrasive particles
dispersed in a slurry.
anode = (high energy/active OR low energy passive)
cathode = (high energy/active OR low energy passive) Correct Ans-anode (higher energy,
active)
, cathode (lower energy, passive)
3 ways to control corrosion Correct Ans-design
environment control
material selection
electrolyte Correct Ans-liquid or other medium that carrys current
electrochemical corrosion process Correct Ans-changes of state aided by electron/ion
movement(conduction)
Galvanic cell Correct Ans-An electrochemical cell which converts the free energy of a
chemical process into electrical energy
Galvanic series chart material order Correct Ans-magnesium Anodic
zinc
lower carbon steel
tin
stainless steel
Metallurgical conditions Correct Ans-Chemical segregation
presence of multiple phases
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