Briefly describe the steps that are used to ascertain whether a particular metal alloy is suitable for use in an automobile valve spring.

1. Briefly describe the steps that are used to ascertain whether a particular metal alloy is suitable for use in an automobile valve spring.
2. Explain how the tensile strength and fatigue strength of a particular metal affect the materials selection process for an automobile valve spring.
3. For a steel alloy material in a helical spring, explain how cold drawing and shot peeing treatments affect the spring performance and lifetime.

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