Question

Strain ageing is common in

• A. High carbon steels
• B. Low carbon steels
• C. High manganese steels
• D. High chromium steels

Hint:

Strain ageing is particularly a concern in forming operations and sheet metals. It can be mitigated by using aluminum-killed steels or adding stabilizers like titanium or niobium.

Answer 1

The Correct Option is B

Strain ageing is a phenomenon where steel becomes harder and less ductile over time after being plastically deformed. It is primarily caused by the interaction of interstitial atoms like nitrogen and carbon with dislocations. This process is more prominent in: - Low carbon steels, because they contain enough interstitial atoms to cause ageing, - And because they are more susceptible to yield point phenomena and Lüders bands formation after deformation. High carbon steels are already relatively strong and have different deformation mechanisms, while high manganese and chromium steels are alloyed to reduce effects like strain ageing.