Next Article in Journal
Surface Treatment Technology of Metals and Alloys
Next Article in Special Issue
Extension of Experimentally Assembled Processing Maps of 10CrMo9-10 Steel via a Predicted Dataset and the Influence on Overall Informative Possibilities
Previous Article in Journal
Fundamental Mechanisms for Irradiation-Hardening and Embrittlement: A Review
Previous Article in Special Issue
The Impact of the Gas Inlet Position, Flow Rate, and Strip Velocity on the Temperature Distribution of a Stainless-Steel Strips during the Hardening Process
Open AccessArticle

Study on the Nucleation and Growth of Pearlite Colony and Impact Toughness of Eutectoid Steel

1
College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
2
Key Laboratory for Mechanical Behavior and Microstructure of Materials of Guizhou Province, Guizhou University, Guiyang 550025, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1133; https://doi.org/10.3390/met9111133
Received: 1 October 2019 / Revised: 14 October 2019 / Accepted: 17 October 2019 / Published: 23 October 2019
(This article belongs to the Special Issue Forming and Heat Treatment of Modern Metallic Materials)
The relationship between microstructure parameters and mechanical properties was studied in this paper. The steel was heat-treated at different austenitizing temperatures to acquire varying microstructure. The results showed that austenite grain size increases with austenitizing temperature, while the pearlite colony size was relatively constant. The strength followed a Hall–Petch relationship with the austenite grain size, but the austenite grain size has nothing to do with the impact toughness. The control unit for determining the impact toughness of pearlitic steel is the pearlite colony size using a comparison method. Further studies have found that, in the hypoeutectoid steel and hypereutectoid steel, the pearlite colony size changes with the austenitizing temperature. However, when the eutectoid steel with a carbon content of 0.81% undergoes the isothermal transformation, the number of grain boundary precipitates is very few. There are many nucleation sites at the grain boundary. The pearlite colonies randomly nucleate at the grain boundaries and grow into the interior of the grains. Simultaneously, new pearlite colonies nucleate by the side of the existing pearlite colony. The intragranular pearlite colonies are also randomly nucleated. These nucleation sites increase the chance of the growing pearlite colonies colliding with each other, eventually resulting in a constant pearlite colony size. View Full-Text
Keywords: pearlitic steel; prior austenite grain; pearlite colony; impact toughness; nucleation pearlitic steel; prior austenite grain; pearlite colony; impact toughness; nucleation
Show Figures

Graphical abstract

MDPI and ACS Style

Zhang, F.; Zhao, Y.; Tan, Y.; Ji, X.; Xiang, S. Study on the Nucleation and Growth of Pearlite Colony and Impact Toughness of Eutectoid Steel. Metals 2019, 9, 1133.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop