Method for determining hardenability of steel by end quenching (Jominy test)

1987 ◽  
Keyword(s):  
Jominy Test

Intercritical Interrupted Jominy Test

2007 ◽  
Vol 537-538 ◽  
pp. 549-554
Author(s):  
Mihály Réger ◽  
Balázs Verő ◽  
Zsolt Csepeli ◽  
Péter Pinke
Keyword(s):  
Cooling Rate ◽  
Treatment Process ◽  
Intercritical Annealing ◽  
Technological Parameters ◽  
Post Heat Treatment ◽  
Quenching Process ◽  
Final Microstructure ◽  
Jominy Test ◽  
The Individual ◽  
Quench Test

The final microstructure of DP and TRIP assisted steels can evolve after hot working (hot rolling) or during post heat treatment process. In the formation of the final structure a number of different technological parameters have important role, e.g. finishing temperature of rolling, cooling rates, temperature of intercritical annealing, etc. As a result of the individual factors and their combinations a lot of production technology routes are feasible. The effect of the different combinations of these technological parameters on the microstructure can be mapped by a special Jominy end-quench test (so called intercritical Jominy end-quench test) described in this paper. Unlike the traditional Jominy test, in this case there is a partial austenizing between A1 and A3 temperatures which results in a given amount of ferrite in the microstructure before quenching. The amount of ferrite depends on the temperature. In some cases the quenching process was interrupted for a given period of time in order to model the cooling process on the run-out table. During cooling each point of the Jominy specimen has a different cooling rate, so the effect of cooling rate on the microstructure can be evaluated along the length of the specimen.

scholarly journals Development and Financial Analysis for the Elaboration Jominy Test Device: Conception of an Engineering Project from the Point of View Undergraduate Students

2020 ◽  
Vol 7 (6) ◽  
pp. 331-336
Author(s):  
Luís Gustavo Fortes Ferreira Giroto ◽  
Giulliano Assis Sodero Boaventura ◽  
Renann Pereira Gama ◽  
Regina Elaine Santos Cabette ◽  
Wilson de Freitas Muniz ◽  
...  
Keyword(s):  
Undergraduate Students ◽  
Financial Analysis ◽  
Point Of View ◽  
Test Device ◽  
Engineering Project ◽  
Jominy Test

Increasing Hardenability and Hardness of Quenching and Tempering Alloys by Substituting Chromium with Manganese

2021 ◽  
Vol 1016 ◽  
pp. 493-498
Author(s):  
Alexander Gramlich ◽  
Fabian Pape ◽  
Götz Heßling ◽  
Wolfgang Bleck
Keyword(s):  
Phase Transformation ◽  
Chemical Composition ◽  
Industrial Production ◽  
Commercial Software ◽  
Cooling Rates ◽  
Transformation Temperatures ◽  
Jominy Test ◽  
Cooling Speed ◽  
Property Changes ◽  
Quenching And Tempering

This study investigates the influence of the substitution of chromium (-0.8 wt.−%) by manganese (+1.3 wt.−%) in a standard quench and tempering steel and the predictability of property changes through simple simulations, only dependent on the chemical composition. The substitution of chromium by manganese leads to an increased hardness (+50 HV10) and a reduction of the critical cooling speed from 19 K s−1 for the reference alloys to 9 K s−1 for the new alloy and a nearly constant hardness of (600 HV10) after Jominy-test. The commercial software JMATPRO is used to simulate and predict key properties for the industrial production. It is shown that a successful simulation of phase transformation temperatures and the general directions of change can be predicted, but more complex properties like critical cooling rates or hardenability need more sophisticated methods.

Predicting hardness profile of steel specimens subjected to Jominy test using an artificial neural network and electromagnetic nondestructive techniques

2020 ◽  
pp. 1-17
Author(s):  
Iman Ahadi Akhlaghi ◽  
Saeed Kahrobaee ◽  
Amir Akbarzadeh ◽  
Mehrdad Kashefi ◽  
Thomas W. Krause
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Hardness Profile ◽  
Nondestructive Techniques ◽  
Jominy Test ◽  
Artificial Neural

Correlation Between Jominy Test and Quenched Round Bars

1941 ◽  
Author(s):  
M. Asimow ◽  
W. F. Craig ◽  
M. A. Grossmann
Keyword(s):  
Jominy Test

scholarly journals PENGARUH VARIASI HOLDING TIME TERHADAP KEMAMPUKERASAN BAJA MENGGUNAKAN ALAT UJI JOMINY

2018 ◽  
Vol 8 (2) ◽  
pp. 257
Author(s):  
Yusuf ◽  
Yudi Chandra
Keyword(s):  
Holding Time ◽  
Jominy Test

Kemampukerasan adalah kemampuan suatu material untuk dapat dikeraskan sampai kedalaman tertentu dengan cara perlakuan panas dengan properti mekanik, hingga terbentuk martensit pada proses pendinginan untuk mencapai kekerasan tertentu. Salah satu metode pengujian hardenability yaitu jominy test (Van Vlack, 1991). Uji jominy merupakan sebuah metode untuk mengetahui kemampuan pengerasan logam (baja). Pengujian jominy tes dilakukan berdasarkan standard ASTM A255. Pengujian dilakukan mengunakan baja ST 42 dengan panjang 100 mm dan diameter 25.4 mm dengan spesimen uji sebanyak 3 buah. Hasil pengujian spesimen 1 dengan holding time 30 menit menghasilkan nilai kemampukerasan 43,7 HRB, untuk spesimen 2 dengan Holding Time 60 menit menghasilkan nilai kemampukerasan 43,7 HRB, sedangkan pada spesimen 3 dengan holding Time 90 menit menghasilkan nilai kemampukerasan 47 HRB. Semakin lama dilakukan holding Time pada spesimen maka nilai kekerasan yang dihasilkan akan lebih tinggi.

Carburized Steel: Quenching Effects, Jominy Test Results

2016 ◽  
pp. 573-586
Author(s):  
Mihai Ovidiu Cojocaru ◽  
Niculae Popescu ◽  
Leontin Drugă
Keyword(s):  
Test Results ◽  
Carburized Steel ◽  
Jominy Test

Numerical Heat Treatment Modelling of Fine Blanked Sheet Metal and Experimental Validation

2015 ◽  
Vol 651-653 ◽  
pp. 1531-1536
Author(s):  
Maurice Peterli ◽  
Niko Manopulo ◽  
Pavel Hora
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Numerical Models ◽  
Present Contribution ◽  
Simulation Accuracy ◽  
Novel Approach ◽  
Bending Process ◽  
Jominy Test ◽  
Hardness Values

Heat treatment is one of the major sources of dimensional inaccuracy in the manufacturing of fine blanked parts. Tools and equipment often need to be iteratively corrected in order to achieve the desired quality. Numerical simulation of the heat treatment process can substantially reduce these efforts. The simulation accuracy on the other hand is strongly dependent on the accurate characterization of the thermo-mechanical boundary conditions as well as material properties. The present contribution aims to propose a novel approach in the calibration of numerical models by using a modified Jominy test as well as heat treatment experiments with parts having residual stresses from a bending process. The results are validated by comparing numerical phase content and hardness values with the corresponding experiments.

Mathematical Modelling of Steel Quenching

2016 ◽  
Vol 879 ◽  
pp. 1813-1818
Author(s):  
B. Smoljan ◽  
Dario Iljkic ◽  
Lovro Štic ◽  
Zvonimir Kolumbić
Keyword(s):  
Numerical Model ◽  
Mathematical Modelling ◽  
Steel Specimen ◽  
Cooling Time ◽  
Cooling Curve ◽  
Hardness Distribution ◽  
Jominy Test ◽  
Quenched Steel ◽  
Low Alloyed Steel ◽  
Volume Method

Mathematical modelling of phase transformations and hardness distribution in non-monotonic quenched steel specimen was developed based on the results of simple experimental test i.e. Jominy test. The hardness in specimen points was estimated by the conversion of cooling time results to hardness by using both, the relation between cooling time and distance from the quenched end of Jominy specimen, and by using the Jominy hardenability curve. The cooling curve at the specimen point was predicted by numerical modelling of cooling by using the finite volume method. Developed numerical model for computer simulation of quenching was also experimentally verified. Limitations of proposed numerical model were found out as well. It has been shown that proposed numerical model can be successfully applied for purposes of simulation of continuous and interrupted quenching of carbon and low alloyed steel specimens.

Sign in / Sign up

Export Citation Format

Share Document