Weld overlay coatings for erosion control

Corrosion and wear resistance of chrome white irons—A correlation to their composition and microstructure

“…pct Cr 5 ð100 À pct K W Þpct Cr M 1 pct K W pct Cr K 100 5 pct Cr M ½1 1 0:01ða À 1Þ pct K W [4] where pct Cr is the nominal chromium content of the material. Equation [4] can be rearranged to give an apparent expression for pct Cr M :…”

“…Combining Eqs. [6] and [5] and considering r % 7.4 g/cm 3 and r K % 6.7 g/cm 3 , [24] electron probe microanalysis has indicated that the value of a in CWI ranges from 4.3 to 4.8 with an average value 4.55; [22,23] we then have pct Cr M 5 pct Cr 1 1 0:032 pct K [7] Maratray and Usseglio-Nanot [17] proposed an empirical formula to estimate the carbide volume fraction pct K in CWIs: pct K 5 12:33 pct C 1 0:55 pct Cr À 15:2 [8] The data in Figure 10 show that Eq. [8] can give a good estimation for the carbide contents of the test materials with a linear correlation coefficient of R 2 5 0.977.…”

“…[8] into Eq. [7], the Cr content in the matrix to the nominal Cr and C contents of the material can be correlated as follows:…”

“…Chrome white irons (CWIs) and their overlays are specifically developed for abrasion-resistant applications, [2] because of their excellent abrasive resistance and moderate ability against impact, which is necessary for crushing, grinding, and slurry erosion applications. [3,4,5] These alloys are readily castable. The carbides present in microstructure, mainly in the form of M 7 C 3 , provide high hardness and wear resistance.…”

“…The carbides present in microstructure, mainly in the form of M 7 C 3 , provide high hardness and wear resistance. [6,7,10] The high chromium content of CWIs is adopted to prevent the formation of graphite and to ensure the stability of the carbides, as well as air hardenability. Copper, manganese, nickel, and molybdenum are typically added to suppress the formation of pearlite on cooling.…”