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Nitriding. The diffusion of nitrogen into the surface layers of low carbon steels at elevated temperature. The formation of nitrides in the surface layer creates increased mechanical properties. Team Nitriding. Beth Blumhardt – Brent Fogal – Greg Mooren – Jana Young. Nitriding.

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slide1

Nitriding

The diffusion of nitrogen into the surface layers of low carbon steels at elevated temperature. The formation of nitrides in the surface layer creates increased mechanical properties.

Team Nitriding

Beth Blumhardt – Brent Fogal – Greg Mooren – Jana Young

slide2

Nitriding

  • Benefits of Nitriding
  • Types of Nitriding
  • Future of Nitriding
  • Process Determination
    • CVD Reaction
    • Deposition Process
    • Diffusion Depth
  • Process Results

Introduction

slide3

Nitriding

  • Principal Reasons for Nitriding are:
    • Obtain High Surface Hardness
    • Obtain a Resistant Surface
    • Increase Wear Resistance
    • Increase Tensile Strength and Yield Point
    • Improve Fatigue Life
    • Improve Corrosion Resistance
    • (Except for Stainless Steels)

Benefits

slide4

Nitriding

  • Improves Mechanical Properties
    • Surface Hardness
    • Corrosion Resistance
  • Chemical Reaction
    • Nitrogen & Iron
    • Core Properties Not Effected
  • Temperature Range
    • 495 - 565 ºC
    • Below Tempering Temperature
  • White Layer By-Product
    • Thin
    • Hard Iron Nitride

Background

slide5

Nitriding

  • Process methods for nitriding include:
    • Gas
    • Liquid
    • Plasma
    • Bright
    • Pack

***Lots of more nitriding methods for specific applications***

http://www.nitriding.co.uk/np01.htm

slide6

Gas Nitriding

  • Gas methods:
    • Case-Hardening Process
    • Nitrogen Introduction
      • Surface of a Solid Ferrous Alloy
    • Suitable Temperature
      • Between 495 and 565°C (for Steels)
    • Nitrogenous Gas
      • Ammonia
slide7

Liquid Nitriding

  • Liquid nitriding:
  • Thermo-chemical Diffusion Treatment
  • Hardening Components With Repeatability. 
  • Salt Bath, at Less Critical Temperatures.
  • Preserves Dimensional Stability
  • Corrosion Protection
  • Exhibit Long-Term Resistance to Wear, Seizure, Scuffing, Adhesion and Fatigue.
slide8

Plasma Nitriding

  • Vacuum Chamber
    • Pressure = 0.64 Pa
  • Pre-Heat Cycle
  • Surface Cleaning
    • Ion Bombardment
  • Control Gas Flow
    • N, H, CH4
  • Ionization by Voltage
  • Blue-Violet Glow
  • Wear Resistant Layer

Set-Up

Process

http://www.milwaukeegear.com/nitrid.htm

slide9

The Future of Nitriding

  • Replacing Liquid Nitriding
    • Environmental Effects
    • Ease of Control
    • More Complex Substrates
    • Performed at Lower Temperatures
    • Creates Higher Residual Stress<

PLASMA / ION NITRIDING

http://www.northeastcoating.com/

slide10

Problem Statement

  • Gas Nitriding
  • How do the variables of nitriding steel affect the process and the mechanical properties of the surface?
    • The following variables were investigated:
        • Time
        • Temperature
        • Gas Velocity
    • Develop Process Model
slide11

CVD Equations

CVD Process

Calculations

slide12

CVD Reaction

Calculations

slide13

CVD Process

Calculations

slide14

Surface Composition

The Following Variables Were Used in The Calculation of Csurface

η(T) ρ(T) D(T) δ(T,v) hmass(T,v)

Calculations

slide15

Case Depth

Calculations

slide16

Case Depth

Calculations

slide17

Case Depth

Calculations

slide18

CONCLUSION

  • Time Effects
    • Increase Diffusion Depth
  • Temperature Effects
    • Surface Composition
    • Deposition Efficiency
    • Diffusion Rate
    • Diffusion Depth
  • Gas Velocity Effects
    • Surface Composition
    • Replenishes Nitrogen Gas
    • Minimizes Stagnant Layer Thickness
slide19

CONCLUSION

  • Microstructural Effects
    • Processing Temperature
    • Surface Microstructure
  • Mechanical Property Effects
    • Improves
      • Surface Hardness
      • Wear Resistance
      • Corrosion Resistance
      • Fatigue Life
      • Yield Strength
    • Lowers
      • Ductility
      • Fracture Toughness

Continued