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Non-metallic inclusions influence on the durability and reliability of bainitic steels under fatigue loading

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Schmidová, E.- Zbořil, J.; 26.9.2008; Lázně Bohdaneč

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Non-metallic inclusions influence on the durability and reliability of bainitic steels under fatigue loading

  1. 1. Schmidová, E.- Zbořil, J. Univerzita Pardubice Dopravní fakulta Jana Pernera NNon-metallic inclusionson-metallic inclusions influenceinfluence on theon the durability and reliability oF bainidurability and reliability oF bainitticic steelsteelss underunder fatiguefatigue loadingloading
  2. 2. Report plan Introduction Targets and methodology of classification Material analyses and partial results Summary classification
  3. 3. Introduction - Wheel – rail contact system
  4. 4. Introduction - Wheel – rail contact system Single and two-point contact between wheel and rail Typical loading – 22,5t per axle
  5. 5. . Ways of the development: microalloying heat treatment application of the diffrent types of micro structure Targets and methodology of classification
  6. 6. Targets and methodology of classification ČSN ISO 4967 ( 420471 )
  7. 7. Development bainitic cast steel like a chance for highly stressed componnets of rail system č.vz. Rp0,2 Rm A KV KIC HV10 Kýlový blok 389 Z1 1084 1350 9 35 382 Z2 1080 1344 9 29 396 Z3 1119 1359 14,3 29 111,2 389 Kolejnice 404 KH4 1080 1375 8,5 29 430 KH5 1061 1341 6,5 24 411 KH6 1061 1374 8,8 31 380 KP4 1092 1362 9,5 30 428 KP5 980 1364 9,3 29 399 KP6 1116 1371 7,5 29 108,4 374 Srdcovka 407 C1(.1) 1070 1378 34 29 403 C2(.1) 1073 1390 33,8 26 413 Z1(.1) 1111 1369 25,3 31 395 Z2(.1) 1116 1392 28,3 31 431 Z3(.1) - - - 28 110,2 393 500x 0 200 400 600 800 1000 1200 1400 0,05 0,1 0,15 0,2 C/Mn průměr A průměr Rp0,2 průměr Kv Polynomický (průměr A) 0 200 400 600 800 1000 1200 1400 0,12 0,14 0,16 0,18 0,2 C/Si průměr A průměr Rp0,2 průměr Kv Polynomický (průměr Rp0,2)
  8. 8. Structural and fracture characteristic Orginal bainitic steel – for lower loads Development bainitic steel – for higher loads
  9. 9. Influence of inherent defects on local changes of fracture mode BT2 Brittle failure area
  10. 10. Influence of cast surface Sulfids of II.character in ralationship on cast surface 1 2 3 4
  11. 11. Summary classification Metallurgic cleanness decrease of the steel mutes influence of the casting defects Presumption for crumbling of the rail´s running area by local loss of plasticity Local loss of the plasticity can be a reason for creating of the conditions for spreading of the cracks from surface demage to the profile of the cast

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