Microstructure and flow behaviour of a quenching and partitioning steel at elevated temperatures

2021 ◽  
pp. 1-11
Author(s):  
Zahra Sangarimotlagh ◽  
Mohamed Amin Karimi Asl ◽  
Amir Momeni ◽  
M. Soltanalinejad
Keyword(s):  
Elevated Temperatures ◽  
Flow Behaviour ◽  
Quenching And Partitioning

Numerical Analysis and Experimental Validation of the Thermo-Mechanical Flow Behaviour of the Hot Stamping Steel MBW® 1500

2015 ◽  
Vol 639 ◽  
pp. 213-220
Author(s):  
Bhargav Potdar ◽  
Stéphane Graff ◽  
Björn Kiefer
Keyword(s):  
Elevated Temperatures ◽  
Hot Stamping ◽  
Tensile Tests ◽  
Flow Behaviour ◽  
Boron Steel ◽  
Virtual Design ◽  
Flow Curves ◽  
Rate Dependent ◽  
Important Input ◽  
Strain Paths

In virtual design of the hot stamping process, a reliable description of the material flow behaviour is an important input to ensure accurate estimations of the parts feasibility. Currently, to characterise the hot stamping material’s flow behaviour at elevated temperatures, tensile and upsetting tests are available. The measurement of the flow behaviour out of such tests, which is generally temperature and strain rate dependent, still remains a complex task. Therefore traditional methods to measure flow curves out of such measurements are not necessarily precise enough. In this contribution the authors focus on non-isothermal conductive tensile tests of the manganese-boron steel MBW® 1500 in order to understand its flow behaviour at elevated temperature. Numerical calculations using Finite Element Method (FEM) of the tests itself with correct boundary conditions as well as for all necessary phenomena are used to identify accurately the material’s flow curves by use of inverse optimisation. Finally, for validation purpose the identified flow curves out of the optimisation method were used to simulate the hot stamping of two different parts. Both geometries were chosen such that various strain paths are covered i.e. uniaxial tension to plane strain.

Flow behaviour and constitutive modelling of a ferritic stainless steel at elevated temperatures

2016 ◽  
Vol 22 (3) ◽  
pp. 474-487 ◽  
Author(s):  
Jingwei Zhao ◽  
Zhengyi Jiang ◽  
Guoqing Zu ◽  
Wei Du ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Elevated Temperatures ◽  
Constitutive Modelling ◽  
Flow Behaviour

scholarly journals Strain-rate sensitive ductility in a low-alloy carbon steel after quenching and partitioning treatment

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Philipp Frint ◽  
Till Kaiser ◽  
Thomas Mehner ◽  
Enrico Bruder ◽  
Mario Scholze ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Retained Austenite ◽  
Elevated Temperatures ◽  
Strain Rates ◽  
High Ductility ◽  
Quenching And Partitioning ◽  
Diffusion Controlled ◽  
Alloy Carbon ◽  
The Many ◽  
Multi Phase

AbstractWe investigate an extraordinarily high ductility in a low alloy carbon steel at an elevated temperature after a quenching and partitioning (Q&P) treatment. The conventional (quenched and tempered) reference material does not show similar behavior. Interestingly, the Q&P treated material’s ductility is considerably reduced at increasing strain rates while strength remains almost constant. These results indicate the presence of a diffusion-controlled deformation mechanism at elevated temperatures. Our research shows that interlath retained austenite is more stable during deformation at higher temperatures, resulting in a delayed transformation to martensite and therefore to a more pronounced contribution to plastic deformation at (and in the vicinity of) the many interfaces inherently present in this multi-phase steel.

scholarly journals ’Quenching and Partitioning’ - An In Situ Approach to Characterize the Process Kinetics and the Final Microstructure of TRIP-Assisted Steel

2011 ◽  
Vol 409 ◽  
pp. 713-718 ◽  
Author(s):  
Thomas Rieger ◽  
Klaus Herrmann ◽  
Dagmar Carmele ◽  
Stephan Meyer ◽  
Thomas Lippmann ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Elevated Temperatures ◽  
Materials Science ◽  
High Strength ◽  
Quantitative Information ◽  
Characterization Methods ◽  
Quenching And Partitioning ◽  
X Ray ◽  
Final Microstructure

The ‘Quenching and Partitioning’ (Q&P) concept aims to increase the strength level of conventional TRIP-assisted advanced high strength steel (AHSS) by replacing ferritic constituents by tempered martensite. The Q&P heat treatment process involves austenitization and interrupted quenching followed by carbon partitioning from martensite to austenite at elevated temperatures. The final microstructure is traditionally investigated at room temperature after metallographic preparation by microscopy and x-ray analysis with laboratory tubes. Besides other disadvantages the established characterization methods are not adequate to observe the development of the microstructure during Q&P treatment. In the present work the microstructural evolution during Q&P processing was monitored by in-situ diffraction experiments using very hard (100 keV) synchrotron x-ray radiation. Debye-Scherrer rings were recorded as a function of time and temperature during the heat treatment in a state-of-the-art dilatometer (type Bähr DIL805AD) at the Engineering Materials Science beamline HARWI-II (HZG outstation at Deutsches Elektronensynchrotron (DESY), Hamburg). The diffraction patterns contain quantitative information on the phases present in the sample (for more details cf. Abstract Carmele et al, this conference). The evolution of the austenite phase fraction during the partitioning treatment at the quench temperature (1-step Q&P) is discussed exemplarily for a Si-based TRIP steel with additions of Ni.

Flow Behaviour of Modified 9Cr–1Mo Steel at Elevated Temperatures

2017 ◽  
Vol 70 (3) ◽  
pp. 589-596 ◽  
Author(s):  
V. Shiva ◽  
Sunil Goyal ◽  
R. Sandhya ◽  
K. Laha ◽  
A. K. Bhaduri
Keyword(s):  
Elevated Temperatures ◽  
Flow Behaviour
Sign in / Sign up

Export Citation Format

Share Document