2013-2014

ASM Heat Treating Society Conference & Exposition

September 16-18, 2013 Indiana Convention Center Indianapolis, Indiana

Graduate Students:
Xiaoqing Cai, Yuan Lu, Anbo Wang, Lei Zhang
Dr. Yingying Wei (May 2013 Graduate)

Professors:
Richard D. Sisson, Jr.

Mei Yang, Assistant Research Professor

THE EFFECTS OF TEMPERING ON THE HARDNESS PROFILES IN CARBURIZED STEELS

Graduate Students:
Lei Zhang and Mei Yang

Professor
R. D. Sisson, Jr.

Abstract:

The results of an experimental program to determine the effects of tempering on the hardness profiles in quenched and tempered carburized steels will be presented and discussed. It was found that typically the hardness increased with carbon concentration up to about 0.65 wt% carbon. It was also found the increasing tempering temperature and time decreased the hardness. The data has been analyzed using the Holloman-Jaffe parameter. The applicability of this model will be presented and discussed. The effects of retained Austenite will also be discussed.

MODELING GAS AND LOW PRESSURE CARBURIZING OF STEEL

Graduate Students:
Xiaolan Wang, Mei Yang, Yingying Wei, Lei Zhang

Professor
R. D. Sisson, Jr.

Abstract:

An effective software tool, CarbTool©, has been developed and verified at CHTE. In this paper the new enhancements to CarbTool© will be presented and discussed. These enhancements and capabilities include hardness profile and case microstructure prediction as well as carbon saturation and carbide precipitation simulations. The experimental verification of these carbon profile based predications will be presented and discussed.

MODELING THE GAS NITRIDING PROCESS FOR STEELS

Graduate Student:
Mei Yang, Xiaolan Wang

Professor
R. D. Sisson, Jr.

Abstract:

Heat treaters need an effective simulation tool to predict the nitriding performance of a wide variety of steels. This tool is needed not only to predict the hardness and nitrogen concentration profiles but also to optimize the process in terms of cycle time and cost. In the present work a new CHTE software model, NitrideTool ©, has been developed to simulate the gas nitriding process of steels. The fundamentals of the model will be presented and discussed including the kinetics of compound layer growth, the determination of the boundary conditions and the nitrogen diffusivity in the diffusion zone. The experimental verification of the model is also presented.

MODELING THE CARBONITRIDING OF STEELS

Graduate Students:
Xiaolan Wang, Mei Yang

Professor
R. D. Sisson, Jr.

Abstract:

A software tool, CarboNitrideTool©, has been developed based on experimental results and our previous carburizing model methodologies. This model includes the concomitant absorption and diffusion of both carbon and nitrogen in the steels. The diffusional interactions of carbon and nitrogen are included. CarboNitrideTool© predicts the carbon and nitrogen concentration profiles in the steel as well as the hardness and as-quenched microstructure profiles. The experimental verification is also presented and discussed.

 

 

 

 

 

 

 

 

 

 

Lunch at Dick’s Restaurant

September 16, 2013