High Interstitial Stainless Austenitic Steels by Hans Berns, Valentin Gavriljuk, Sascha Riedner
By Hans Berns, Valentin Gavriljuk, Sascha Riedner
High Interstitial Stainless Austenitic Steels is of curiosity to all engineers and resaerchers operating with stainless-steel, both at universities or R&D departments in undefined. the hot purposes defined attract layout engineers whereas procees engineers locate fascinating demanding situations. those novel steels input progressively more commercial purposes. Their improvement is gifted through this e-book in its entirety, ranging from the digital scale of parts. This makes it particlularly appealing to fabrics Scientists and steel Physicists.
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Extra info for High Interstitial Stainless Austenitic Steels
This is why the ordered c0 -phase Fe4N exists, and, based on the quoted studies [20, 21], one can state that carbon atoms in austenitic steels are prone to form clusters, whereas the distribution of nitrogen atoms is characterized by short-range atomic ordering. For studies of atomic distribution in the solid solutions alloyed with C ? 91N was used . The samples were prepared by Dr. Rawers, Albany Research Center, USA, and obtained by a special technique of melting an iron-carbon steel in a hot isostatic pressing (HIP) furnace under a nitrogen gas pressure of 160 MPa (see ).
With decreasing deformation temperature or increasing nitrogen and manganese contents, the onset of twinning is shifted to lower strains, whereas the dislocation density decreases in between the twins. e. the formation of twins within the space between the 48 3 Structure primary twins . The multiple twin system was analysed in terms of an increase in the efficiency of twins as hardening obstacles for gliding dislocations and formation of new twins. At the same time, no remarkable twinning was found in other studies of cold worked austenitic nitrogen steels.
Nitrogen, the spatial distribution of free electrons is more homogeneous and their density increases also in the vicinity of carbon atoms (compare Figs. 4a and c). The occurrence of excessive free electrons around the nitrogen atoms allows to interpret some unordinary mechanical properties of austenitic nitrogen steels, namely quasi-cleavage at low temperatures and high strain rates, which will be discussed in Sect. 1. Experimental studies confirm the results of theoretical calculations. The concentration of free electrons was measured by conduction electron spin resonance, CESR, [7–9], the essence of which is shown in Fig.