Abstract
An automotive component (steering helical gear) made from low-alloy structural steel SCr420H was gas-carburized and oil-quenched. Axial contraction of total length was measured after such case-hardening process. Using DEFORM-HT Ver 6.1 simulation tool incorporating phase transformation kinetics, the causal factor of negative axial distortion is studied. Analysis of time-dependent displacement, temperature, phase transformation, and stress-strain generation is presented. Total strain and individual strain (e.g., thermal, elastic, plastic, phase transformation, and transformation plasticity strain) are included. Three simulations consisting of case hardening with transformation plasticity (TP), case hardening without TP, and through hardening with TP were conducted to asses the influence of transformation plasticity and martensite as well as retained austenite in contributing the axial contraction of total length. Finally, transformation plasticity has a greater influence than volume fraction of martensite and retained austenite in producing the negative axial distortion.
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