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Materials selection - properties

Materials selection - properties. Materials selection - properties. Materials selection - properties. Materials selection - environment. Bicycle frames. Bicycle frames. Bicycle frames – hot piercing for seamless tubing. Bicycle frames – cold drawing of seamless tubing.

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Materials selection - properties

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  1. Materials selection - properties

  2. Materials selection - properties

  3. Materials selection - properties

  4. Materials selection - environment

  5. Bicycle frames

  6. Bicycle frames

  7. Bicycle frames – hot piercing for seamless tubing

  8. Bicycle frames – cold drawing of seamless tubing Cold drawing – need high formability ––> extensive work-hardening

  9. Bicycle frames

  10. Bicycle frames

  11. Bicycle frames – common materials used density modulus Plain carbon steel 7.8 gm/cc 200GPa Cr-Mo steel 7.8 200 6061–T6 2.7 70 Ti-3Al-2.5V 4.5 110 Polymer composite yield yield/density Plain carbon steel 240 MPa 30 Cr-Mo steel 485 62 6061–T6 260 95 Ti-3Al-2.5V 700 156

  12. A little bit more on Ti and its alloys Ti is polymorphic: -Ti (hcp) ––> -Ti(A2) at 882°C Ti mostly alloyed with Al, V Remember - & -Fe w/ chromium, & nickel Various elements have different solubilities in - & -Ti

  13. A little bit more on Ti and its alloys Ti-3Al-2.5V is an "- alloy" Enuf -stabilizer (V) added so that a little  phase can exist at room temp &  phase solution strengthened by Al & V  alloys are stronger than those containing only  or  phase

  14. Joining techniques Conventional arc welding Tungsten inert gas (TIG) welding Brazing Adhesive bonding

  15. Use butted tubing for strengthening HAZ region Joining techniques Plain carbon steel frame – TIG welded Tubing is strengthened by drawing operation – but softened near weld

  16. Joining techniques Cr-Mo steel frame – TIG welded But weld and HAZ harder than tubing – more rapid cooling than that experienced by tubing – get Bainite original tube

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