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Name: Chikara Nakao Birth : Kyoto, Japan

Explore Komatsu's steel manufacturing innovations in heavy machinery production, including carburizing techniques, microstructure development, and material analysis.

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Name: Chikara Nakao Birth : Kyoto, Japan

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  1. Name: Chikara Nakao Birth : Kyoto, Japan

  2. Establishment of Komatsu : May 13, 1921 Net Sales : US$ 10.2 Billion Construction Equipment Sales : US$ 6.9 Billion Number of Employees : 28,522 *as of March 31, 2000 *All data is on a consolidated basis unless defined specifically. Outline of Komatsu Construction & Mining Equipment Businesses: Electronics Industrial Machinery Others

  3. Komatsu UK (established in 1985) Durham 87 companies Japan The Americas 22 companies 18 companies Asia and Oceania Group Companies Osaka plant Head office Tokyo 15 companies Europe, Middle East and Africa 142consolidated companies

  4. Payload capacity 290 tons Flywheel horsepower 2,500 HP(1,865 kW) 930E

  5. Board of directors Production Division Head office administration Research Division Developing Division Manufacturing Engineering Development Center Administration Dept. Awazu Plant Osaka Plant Oyama Plant Materials Development Group Process Development Group System Development Group

  6. Heat treatment for Hydraulic Excavator

  7. Dispersion of Aluminum Nitride by carbonitriding process in Al containing Steels 1.0 Al mass% 0 1 2 N mass ppm Solubility of AlN in Austenite

  8. Gas Carburizing Carbonitriding 40 min 20 min 4.0H CP=1.3 CP=0.8 (CH3OH+C3H8 + NH3) (CH3OH+C3H8) 1 3 NH3 = N2+ H2 2 2 { 3 NH3 = N+ H2 2 CP: Carbon potential

  9. Microstructure (5% nital)

  10. Nitrogen profile (EPMA) %N Distance from surface

  11. Effects of Al content on nitride precipitates layer Nitride precipitates layer x A Low Al steel B Medium Al steel C High Al steel

  12. C N C dx d ( 0 ) N C -D = Al N d x d t S C N Wager's internal oxidation equation (mol/m3) N C S d C N N @ d x ÉÃ x x 0 (m) At x=x, consumption of Al is equal to nitrogen supply .

  13. Low CNS Low Al content Medium Al content High Al content Experimental x High CNS Low Al content Medium Al content High Al content 0 0 Calculated x

  14. Numerical analysis of N and Al distribution Al Concentration N Distance from surface

  15. Prediction of hardness, stress, and stain in various conditions Input Shape, chemical composition of steel, Jominy curve, CCT data .... Calculation (FEM) Carbon diffusion, thermal calculation, elasto-plastic analysis Output Carbon distribution, hardness, microstructure, stress, distortion....

  16. Calculation of carburizing and quenching tensional Austenite Martensite compressive Bainite Carbon distribution Microstructure ( 20 sec after quenching) Hardness profiles Residual stress distribution 930C Steel : SCM420H (Fe-0.21C-0.25Si-0.73Mn-0.1Ni-1.0Cr-0.25Mo) 850C 5h 1h 1h Heat-treatment : Carburizing

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