Characterization and Processing of AISI 405 Stainless Steel for Energy Generation Applications
- PDF / 674,222 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 40 Downloads / 181 Views
Characterization and Processing of AISI 405 Stainless Steel for Energy Generation Applications O. Covarrubias1, V. Paramo2 1 Frisa Aerospace SA de CV, Valentín G. Rivero 200, Col. Los Treviño, Santa Catarina, Nuevo León, 66150, México. E-mail: [email protected] 2
Programa Doctoral en Ingeniería de Materiales, Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Ciudad Universitaria, San Nicolás, Nuevo León, 66450, México.
ABSTRACT Rings produced considering industrial conditions were manufactured by ring rolling procedures. In order to evaluate the effect of heat treating on AISI 405 (UNS S40500) structure and properties, statistical software Minitab® was considered for a design of experiments involving parameters as annealing temperature and soaking time. Samples/coupons from rolled rings were annealed according design of experiments. Tensile and hardness testing was performed and reported as response surface curves after statistical analyses. Alloy characterization includes observations performed by scanning electron microscopy for evaluation of phases in order to determine alloy behavior when exposed to annealing conditions. Keywords: Annealing, forging, grain size, microstructure, steel. INTRODUCTION AISI 405 stainless steel (UNS S40500) is the ferritic version of the 12.0%Cr AISI 410 martensitic stainless steel (UNS S41000). A small addition of aluminum (nominal 0.20%) restricts the formation of austenite at high temperature so hardening is controlled upon quenching [1, 2, 3]. This characteristic makes AISI 405 specially suited as a structural alloy for applications where appropriate mechanical strength, corrosion resistance and oxidation resistance are required at temperatures up to 649°C. Applications of AISI type 405 include vessel linings for petrochemical industry, nozzles, nozzles rings and precision rolled profiles for steam turbine parts [4, 5, 6, 7, 8]. Ring rolling is the natural election for manufacture of many of these components due to inherent properties imparted by this hot-working process as microstructural uniformity and improved mechanical properties [9]. Process parameters related to manufacture of AISI 405 components can involve variables as hot-working temperature, deformation ratios and heat treatment parameters. Since limited information for processing AISI 405 is available, alloy characterization must be considered to define best manufacturing conditions. Characterization of metallic alloys can be optimized by appropriate design of experiments. Considering this, it is possible to have sufficient information to determine an alloy behavior when it is exposed to selected process parameters in order to promote desired microstructural and mechanical properties. The use of statistical tools included in statistical software as Minitab®, allows design of experiments that achieves a good response to processing with a minimal of repetitions. One of
Mater. Res. Soc. Symp. Proc. Vol. 1275 © Materials Research Society
these statistical tools is called “surface re
Data Loading...
