Effect of Grain Boundaries Type on Carbides Precipitates in Tempered Martensite

Abstract:

Different types of carbide phases and regions of their precipitation in tempered martensite of austenitic steel have been investigated with orientation microscopy (EBSD) and electron microprobe analysis. The steel structure consisted of large grains of high-temperature ferrite (~ 15%), without visible mesostructured, and martensite packages with a great number of low-angle boundaries. High-angle boundary spectrum with the most prominent coincidence site lattice (CSL) boundaries, Σ3, Σ11, Σ25b, Σ33с Σ41с, is typical for martensite. This spectrum, resulted from austenite transformation by shear mechanism according to orientation relationships (OR), intermediate between Kurdjumov-Sachs (K-S) and Nishiyama-Wassermann (N-W). In the structure two types of carbide precipitates were observed: large MC [~ NbC] along the boundaries of former austenite grains, and dispersed M₂₃C₆ [~ (W,Mo)₂(Cr,Fe)₂₁C₆] predominantly along the boundaries in martensite packages. It has been shown that under martensite tempering M₂₃C₆ precipitation was mainly at high-angle intergranular boundaries. Carbide almost did not precipitate at low-angle and special CSL Σ3 boundaries. A few carbides were detected at special CSL boundaries, Σ11, Σ25b, Σ33с Σ41с.

• Periodical: Materials Science Forum (Volume 946)
• Pages: 368-373
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.946.368
• Online since: February 2019
• Authors: Vladimir I. Pastukhov*, Sergey S. Khvostov, Mikhail L. Lobanov
• Keywords: Carbide, CSL Boundaries, Martensite Transformation, Orientation Microscopy, Orientation Relationship, Stainless Steel, Tempered Martensite

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