The Determination of Active-Passive Regions of Austenitic Stainless Steels by the Measurement of Polarization Characteristics. (Preliminary Report)

The 1.4301 stainless steel is part of the category of austenitic stainless steels, steels which do no undergo heat treatments in general, as they are intended for hot plastic deformation in particular. The aim of the research presented in this paper was to obtain significantly improved characteristics of the resistance properties in relation to the values obtained under classical conditions, by applying heat treatments. Samples taken from the delivery state material underwent annealing, quenching and ageing heat treatments. Subsequently, the samples thus treated were subjected to tests enabling the determination of the correlations between the heat treatment parameters, the structure and the properties.

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The Determination of Bias Factor Stress Dependence from Experimental Data on Irradiation Creep and Stress-Affected Swelling in Austenitic Stainless Steels

Effects of Radiation on Materials: 20th International Symposium ◽

10.1520/stp10546s ◽

2008 ◽

pp. 401-401-12 ◽

Cited By ~ 1

Author(s):

YV Konobeev ◽

VA Pechenkin ◽

FA Garner

Keyword(s):

Experimental Data ◽

Stainless Steels ◽

Austenitic Stainless Steels ◽

Stress Dependence ◽

Irradiation Creep ◽

Bias Factor

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Thermal Influences on Deep Drawing Process of Ferritic and Metastable Austenitic Stainless Steels

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.769.221 ◽

2013 ◽

Vol 769 ◽

pp. 221-228 ◽

Cited By ~ 4

Author(s):

Philipp Schmid

Keyword(s):

Stainless Steels ◽

Deep Drawing ◽

Austenitic Stainless Steels ◽

Forming Limit ◽

Martensite Formation ◽

Forming Process ◽

High Dependency ◽

Forming Tools ◽

Forming Limit Curves

Sheet metal forming processes, in particular deep drawing processes, are highly influenced by occurrence of latent and friction heat. Especially when forming metastable austenitic stainless steels, strain-induced martensite formation is suppressed by higher temperatures and therefore influences the material behavior and so called TRIP-effect. This study gives an overview about thermal influences on the deep drawing forming process of metastable austenitic CrNi-steel 1.4301 in comparison with ferritic stainless steels such as 1.4016. Measurements on serial and evaluation tools were carried out to determine occurring temperatures within forming tools. Attention is paid to effects on tribological aspects such as behavior of lubricants at higher temperatures, influence of temperature development on the martensite formation, mechanical properties, forming limit curves as well as heat flow within the forming tools. Lubricants with different temperature stability were compared to each other with determination of friction coefficient in strip drawing tests. Martensite and temperature development during forming of material was measured in non-isothermal tensile tests approving a high dependency of martensite formation on temperature. Forming limit curves for temperatures determined from RT to 140°C for EN 1.4301 are showing high dependency of necking behavior especially under plain strain conditions. Determination of thermal contact conductance coefficients for process and tool relevant material combinations allows interpreting heat flow mechanisms in forming tools and improving forming process to higher robustness. Results of this paper can be used to individually set boundary conditions for thermo-mechanical coupled forming simulation of austenitic stainless steel and process layout of tool temperature control systems.

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