Date Published: 10/19/2019
Abstract:
Quench hardening is a necessary process for improving the mechanical and fatigue performance of load bearing steel components, but liquid quenching can lead to large distortions. High pressure gas quenching is becoming a more popular choice, with the assumption that a slower cooling rate will lead to less distortion. While true for certain geometries, nonlinearities in distortion response can make understanding the dimensional change of a component difficult due to the inherently complex behavior during quenching. Through the use of modeling, and a specially designed coupon, the out-of-round distortion of an eccentric bore is examined for common high-pressure gas quenching conditions. The causes of distortion are examined and explained using the model, with insights into why the cooling rate has nonlinear relation with distortion.
Author: Justin Sims, Zhichao Li, and B. Lynn Ferguson
Tags: Distortion, Steel, Heat Transfer Coefficient, Phase Transformation, Martensite, Austenite, and Microstructure
Process Used: Heating, Austenitizing, and High Pressure Gas Quench
Other Topics:
