IMPROVEMENT IN FATIGUE RESISTANCE OBTAINED BY WATER QUENCHING UNTREATED 5-1/2" TIMES 10" PASSENGER AND FREIGHT CAR AXLES FROM 1000 DEGREES F

Fatigue tests were made on eleven passenger car axle assemblies and seven freight car axle assemblies prepared from axle forgings which had been modified by water quenching from 1000 degrees F. These forgings were originally produced to AAR Spec. M-101-49, Grade A, but were given this subsequent treatment to determine the improvement in fatigue resistance that could be obtained from the beneficial thermal residual stresses produced by quenching from below the critical. It was concluded that water quenching untreated axle forgings does not improve the resistance to initiation of fatigue cracks in the wheel fit portion, but does greatly increase the resistance to breaking off in the wheel fit. In some cases over 100%.

• Corporate Authors:

  Association of American Railroads

  3140 South Federal Street
  Chicago, IL  United States  60605
• Authors:
  • Horger, O J
  • Neifert, H R
• Publication Date: 1953-12

Media Info

• Features: Figures; Photos; Tables;
• Pagination: 28 p.

Subject/Index Terms

• TRT Terms: Axles; Bending; Bending stress; Cracking; Defects; Equipment tests; Fatigue (Mechanics); Fatigue (Physiological condition); Freight cars; Hardness; Passenger cars; Railroad cars; Residual stress; Stresses; Technology; Thermal stresses
• Uncontrolled Terms: Quenching
• Geographic Terms: United States
• Old TRIS Terms: Axle defects; Axle fatigue; Test equipment
• Subject Areas: Railroads; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00040360
• Record Type: Publication
• Report/Paper Numbers: MR-213 Res Rpt
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM