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← TechnologyWhich failure mode arises during creep-feed grinding with inadequate coolant?
A)Thermal cracking of workpiece's surface✓
B)Excessive wheel wear from dressing
C)Vibration-induced surface chatter marks
D)Increased plastic deformation near edge
💡 Explanation
Thermal cracking results when excessive frictional heat isn't dissipated via coolant; the increased localized temperature induces thermal stress exceeding the material's tensile strength—the mechanism is thermal fatigue because crack propagation occurs, rather than plastic deformation.
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