Improved Truck Castings

Opportunity/Problem:

Repair welds in critical areas of side frames and bolsters must undergo full furnace re-heat treatment.  Welds in non-critical areas can form undesirable microstructures because of high cooling rates.

Truck castings can fail in a brittle manner at low temperatures.  Components which maintain ductility at low service temperatures could prevent such failures.

Description:

The Improved Truck Castings project focuses on improving the safety of train operations by reducing the number of in-service failures due to poor microstructure. 

Objective(s):

  • Identify or develop steels that do not form undesirable microstructures after welding
  • Identify or develop steels that retain adequate toughness to prevent brittle failure at
    low temperatures
  • Candidate alloys will undergo testing in next phase of project

Rail Impact:

  • Reduce failure rates of truck castings due to poor microstructure after repair welding
  • Reduce failure rates of truck castings due to brittle failure in low temperature service

 

Improved Truck Castings