Presentation is loading. Please wait.

Presentation is loading. Please wait.

Nitriding Team Nitriding

Similar presentations

Presentation on theme: "Nitriding Team Nitriding"— Presentation transcript:

1 Nitriding Team 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

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

3 Nitriding Benefits 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

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

5 ***Lots of more nitriding methods for specific applications***
Process methods for nitriding include: Gas Liquid Plasma Bright Pack ***Lots of more nitriding methods for specific applications***

6 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

7 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.

8 Plasma Nitriding Set-Up Process
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

9 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

10 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

11 CVD Equations CVD Process Calculations

12 CVD Reaction Calculations

13 CVD Process Calculations

14 Calculations Surface Composition
The Following Variables Were Used in The Calculation of C surface η(T) ρ(T) D(T) δ(T,v) hmass(T,v) Calculations

15 Case Depth Calculations

16 Case Depth Calculations

17 Case Depth Calculations

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

19 CONCLUSION Continued 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

Download ppt "Nitriding Team Nitriding"

Similar presentations

Ads by Google