AddThis Social Bookmark Button

Google
Web www.calphad.com














AddThis Social Bookmark Button

Google
Web www.calphad.com

Phase Diagrams

Iron-Manganese (Fe-Mn) Phase Diagram

In pure iron, the A4 (1394 °C) and A3 (912 °C) transformations take place at constant temperatures. If an element enters into solid solution in iron — forming in that way a binary alloy — each of these transformations are required by the Phase Rule to occur over a range of temperature.

Some elements, such as manganese, raise the A4 and lower the A3 transformation temperatures (Figure 1), increasing, in effect, the extent of the gamma (γ) field in the iron-carbon phase diagram.


Iron-Manganese (Fe-Mn) Phase Diagram

Figure 1. Fe-Mn phase diagram shows which phases are to be expected at equilibrium for different combinations of manganese content and temperature. The Fe-Mn phase diagram was calculated with Thermo-Calc, coupled with PBIN thermodynamic database. The melting point of iron and manganese at the pressure of 101325 Pa is 1538 °C and 1246 °C, respectively.

The iron-manganese binary system has recently become a basis for a new class of metallic degradable biomaterials manufactured by powder metallurgy. An example is Fe-35Mn alloy (wt. %) which is aimed to be used for stent applications. A cast Fe-35Mn alloy can achieve a yield strength as high as 200 MPa and elongation at rupture up to 50 % (T. F. Volynova: Metal Sci. Heat Treat., 1984, 26, 476-482).

Alloying with more than 29 wt. % manganese provides a completely austenitic structure which exhibits antiferromagnetic behavior (A. Rabinkin: Calphad, 1979, 3, 77-84).

Free Download

• The phase diagram of Iron-Manganese binary system

Consulting Services

To cover the costs of running this site, we accept consulting assignments 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: info@calphad.com.