Metallic materials - Determination of forming-limit curves for sheet and strip

2020 ◽  
Keyword(s):  
Forming Limit ◽  
Metallic Materials ◽  
Forming Limit Curves

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

2013 ◽  
Vol 769 ◽  
pp. 221-228 ◽  
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.

Experimental Research of the Formability of Lightweight Metallic Materials Used in Automotive Industry

2015 ◽  
Vol 760 ◽  
pp. 391-396 ◽  
Author(s):  
Claudia Girjob ◽  
Octavian Bologa ◽  
Sever Gabriel Racz ◽  
Cristina Biris
Keyword(s):  
Magnesium Alloy ◽  
Deformation Behaviour ◽  
Alloy System ◽  
Tensile Tests ◽  
Forming Limit ◽  
Metallic Materials ◽  
Az31b Magnesium Alloy ◽  
Materials Used ◽  
Experimental Researches ◽  
Forming Limit Curves

This paper aims to study the plastic deformation behaviour of lightweight metallic materials in order to reduce the total weight of the vehicles without affecting their performances. For the theoretical and experimental researches presented here, among these materials the AZ31B magnesium alloy has been chosen, a representative alloy for the magnesium-zinc-aluminium alloy system. The results of the theoretical researches, made on finite elements models, were validated by means of experimental researches consisting of tensile tests, forming limit curves determination tests and AZ31B magnesium alloy drawing, respectively.

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