By Santosh S. Hosmani, P. Kuppusami, Rajendra Kumar Goyal (auth.)
An advent to floor Alloying of Metals goals to function a primer to the elemental features of floor alloying of metals. The booklet serves to clarify basics of floor amendment and their engineering purposes. The ebook starts off with fundamentals of floor alloying and is going directly to disguise key floor alloying tools, resembling carburizing, nitriding, chromizing, duplex remedy and the characterization of floor layers. The booklet will turn out important to scholars at either the undergraduate and graduate degrees, as additionally to researchers and practitioners searching for a short advent to floor alloying.
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Additional info for An Introduction to Surface Alloying of Metals
See Ref.  for VN). e. more nitrogen than necessary for (i) precipitation of all alloying element as nitride, ½NMeNn , and (ii) equilibrium saturation of the ferrite matrix, [N]0a. The total amount of excess nitrogen can be divided into two types: mobile and immobile excess nitrogen. A significant part of the excess nitrogen in nitrided binary iron-based alloys is adsorbed at the nitride/matrix interfaces, [N]interface. 8 Some of the Interesting Researches in Nitriding and Carburizing 25 Fig.
Similar nitriding behavior in Fe–Cr alloys is observed. It must be noted that the above-mentioned continuous and discontinuous precipitation morphologies are not reported in the literature for nitrided Fe–Ti [3–5] and Fe–Al [6–12] alloys. 3 Excess Nitrogen The phenomenon of ‘‘excess nitrogen’’ in nitrided iron-based alloys was introduced in Chap. 1. The quantity of ‘‘excess nitrogen’’ is the difference between actual (experimental) nitrogen content and expected (theoretical) nitrogen content in the 34 2 Nitriding of Binary Iron-Based Alloys: An Overview nitrided alloys.
The mechanism for the discontinuous coarsening in nitrided Fe–V and Fe–Cr alloys is explained in Refs. [21, 24]. The essence of this mechanism is summarized below. During nitriding, diffusing nitrogen interacts with vanadium (in Fe–V alloys) or chromium (in Fe–Cr alloys). This interaction initially leads to the formation of vanadium nitride or chromium nitride precipitates which are finely dispersed in aFe (ferrite) matrix (‘‘continuous’’ precipitation). , plate-like precipitates of VN are typically about 40 Å long with thickness of about 10 Å) which are probably coherent/semi-coherent with the a-Fe matrix [18, 31].
An Introduction to Surface Alloying of Metals by Santosh S. Hosmani, P. Kuppusami, Rajendra Kumar Goyal (auth.)