A kinetic model of the austenitization behavior of additively manufactured 17-4 PH martensitic stainless steel
Source abstract
Abstract
Austenitization is significant for understanding the microstructure and residual stress evolution in additive manufacturing of non-austenitic steels. However, the accurate modeling of austenite transformation of additively manufactured parts is rarely reported. In this work, a new kinetic model is proposed to describe the diffusional austenitization of additively manufactured 17-4 PH martensitic stainless steel. The proposed kinetic model is based on the classic Johnson-Mehl-Avrami-Kolmogorov (JMAK) theory, and incorporates a new austenite grain growth model that accounts for the maximum austenite grain size and the effective driving force for growth. Experimental results obtained through dilatometry show that the proposed kinetic model is able to fit and predict the austenite transformation curves across a wide range of heating rates. This model accurately predicts the saturated austenite fraction by maximum austenite grain size and facilitates the understanding of the effect of heating rate on diffusional austenite transformation behavior. The findings imply that the drag force restricting the maximum austenite grain size originates from the initial martensitic microstructure. The transition from the diffusional austenitization to massive or displacive phase transformation at the heating rate of 100°C/s is identified for additively manufactured 17-4 PH martensitic stainless steel.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · Welding Techniques and Residual Stresses · Microstructure and Mechanical Properties of Steels
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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