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1、AEB-L is a conventionally ingot-cast martensitic stainless steel designed and manufactured by Uddeholm Tooling AB (Sweden). Its nominal chemical composition (in weight percent) is as follows:C = 0.65Cr = 12.8Si = 0.4Mn = 0.65Figure 1 shows the phase diagram of Uddeholm AEB-L stainless steel (in deg.
2、 Celsius) calculated with Thermo-Calc, coupled with TCFE3 thermodynamic database.Figure 1. Phase diagram of Uddeholm AEB-L stainless steel (in deg. Celsius) calculated with Thermo-Calc, coupled with TCFE3 thermodynamic database. Silicon and manganese were excluded from thermodynamic calculations.The
3、 equilibrium values for solidus and liquidus temperatures were calculated to be 1461 C (2661 F) and 1379 C (2515 F), respectively.In the temperature range of 1144-1379 C (2091-2515 F) the microstructure of Uddeholm AEB-L stainless steel consists of just one single phase: austenite. Thus, if AEB-L st
4、eel is hardened from an austenitization temperature that is higher than 1144 C (2091F) the resulting martensitic microstructure will contain no primary carbides.Below the temperature of 1144 C (2091 F) the chromium-rich M7C3 primary carbides start to precipitate from the austenitic matrix. At the au
5、stenitization temperature of, say, 1052 C (1925 F) the equilibrium amount of chromium-rich M7C3 primary carbides is 3.3 molar percent (2.6 volume percent). The equilibrium amount of carbon and chromium in the austenitic matrix at 1052 C (1925 F) is 0.44 wt. % and 11.4 wt. %, respectively. (The amoun
6、t of carbon and chromium in the matrix is a good indicator of the steels hardenability and corrosion resistance, respectively.)The equilibrium value for A1 temperature (eutectoid temperature) was calculated to be 814 C (1497 F). Under equilibrium conditions the austenite in Uddeholm AEB-L stainless
7、steel transforms into ferrite at this temperature.Finally, please see additional information about the Fe-Cr-C ternary phase diagrams.Free Downloads Phase diagram (in deg. Celsius) of Uddeholm AEB-L stainless steel Phase diagram (in deg. Fahrenheit) of Uddeholm AEB-L stainless steelMartensitic stain
8、less steel such as 154CM contains about 4 wt. percent molybdenum (in addition to 1.05 wt. % C and 14.0 wt. % Cr). To determine the effect of 4 wt. % Mo on the Fe-Cr-C ternary system, consider Figures 5 and 6, which show the isothermal sections of Fe-4Mo-Cr-C quaternary phase diagram at 1000C (1832F)
9、 and 1100C (2012F), respectively.Figure 5. Isothermal section of Fe-4Mo-Cr-C quaternary phase diagram at 1000C (1832F) calculated with Thermo-Calc coupled with TCFE2000 thermodynamic database.According to Thermo-Calc calculations, the austenitic matrix of Fe-4Mo-14Cr-1.05C alloy at 1000C (1832F) has
10、 the following chemical composition (in weight percent):Cr = 8.6 C = 0.33Mo = 2.6 The amount of chromium-rich M23C6 primary carbides in Fe-4Mo-14Cr-1.05C alloy at 1000C (1832F) is calculated to be 16.8 mol. percent. It is worth noting that the addition of 4 wt. % Mo to the Fe-Cr-C system expands sig
11、nificantly the presence of M23C6 phase at the expense of the M7C3 phase (compare Figure 1 Isothermal Section of Fe-Cr-C Ternary Phase Diagram at 1000C and Figure 3 Isothermal Section of Fe-0.8Mo-Cr-C Quaternary Phase Diagram at 1000C with Figure 5).Figure 6. Isothermal section of Fe-4Mo-Cr-C quatern
12、ary phase diagram at 1100C (2012F) calculated with Thermo-Calc coupled with TCFE2000 thermodynamic database.According to Thermo-Calc calculations, the austenitic matrix of Fe-4Mo-14Cr-1.05C alloy at 1100C (2012F) has the following chemical composition (in weight percent):Cr = 10.6C = 0.58Mo = 3.4 Th
13、e amount of chromium-rich M23C6 primary carbides in Fe-4Mo-14Cr-1.05C alloy at 1100C (2012F) is calculated to be 11.6 mol. percent.The amount of chromium and molybdenum in the matrix is also an indicator of the secondary-hardening response in general, the higher the amount of chromium and molybdenum
14、 in the matrix, the stronger the secondary-hardening response during tempering (especially at higher tempering temperatures.) Part 1: Fe-Cr-C Ternary Phase DiagramsPart 2: Fe-0.8Mo-Cr-C Quaternary Phase DiagramsConsulting ServicesTo cover the costs of running this site, we accept consulting assignme
15、nts to perform customer tailored Thermo-Calc and DICTRA calculations. If we cannot solve your problem, we will help you find at least one organization which has the right human and computational resources to address your specific needs.We offer a money back guaranty for our consulting services if you are not satisfied. Drop us a line; our e-mail address is: .A high hardness level, a fine array of uniformly distributed primary alloy carbides, and an adequate matrix chromium content are the three most desired properties required to produce a knife
