Why can the properties of steel be changed through heat treatment? Oa) Because the steel expands as it heats up. Ob) Because when the steel is held at elevated temperatures grains shrink in size. Oc) Because of the phase change from ferrite to cementite. Od) Because of the phase changes from BCC to FCC to BCG. What does the following illustration show? N Oa) An electromagnet with a magnetic field. Ob) A bar-magnet with a magnetic field. Oc) A magnetic yoke. Od) Lines of induced magnet saturation.
Why can the properties of steel be changed through heat treatment? Oa) Because the steel expands as it heats up. Ob) Because when the steel is held at elevated temperatures grains shrink in size. Oc) Because of the phase change from ferrite to cementite. Od) Because of the phase changes from BCC to FCC to BCG. What does the following illustration show? N Oa) An electromagnet with a magnetic field. Ob) A bar-magnet with a magnetic field. Oc) A magnetic yoke. Od) Lines of induced magnet saturation.
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
Transcribed Image Text:Why can the properties of steel be changed through heat treatment?
Oa) Because the steel expands as it heats up.
Ob) Because when the steel is held at elevated temperatures grains shrink in size.
Oc) Because of the phase change from ferrite to cementite.
Od) Because of the phase changes from BCC to FCC to BCG.

Transcribed Image Text:What does the following illustration show?
N
Oa) An electromagnet with a magnetic field.
Ob) A bar-magnet with a magnetic field.
Oc) A magnetic yoke.
Od) Lines of induced magnet saturation.
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