Effect of Compressive Stress on Diffusional Transformation in 0.5%C Spring Steels With Different Austenite Grain Sizes

2021 ◽  
Author(s):  
Rintaro Ueji ◽  
◽  
Tadanobu Inoue ◽  
Keyword(s):  
Compressive Stress ◽  
Grain Sizes ◽  
Austenite Grain ◽  
Spring Steels ◽  
Diffusional Transformation

Fracture Behavior and Microstructure of 60Si2MnA Spring Steels Modified by V-Nb Inoculants

2011 ◽  
Vol 415-417 ◽  
pp. 1085-1089
Author(s):  
Tie Bao Wang ◽  
Chun Xiang Cui ◽  
Lin Fang ◽  
Shao Jing Bu
Keyword(s):  
Melt Spinning ◽  
Fracture Behavior ◽  
Prior Austenite ◽  
Fracture Morphology ◽  
Tensile Fracture ◽  
Grain Sizes ◽  
Austenite Grain ◽  
Spring Steels ◽  
Nb Microalloyed Steel ◽  
Prior Austenite Grain

The microstructure of V-Nb inoculants after melt spinning was investigated by performing TEM examination and to the sample steels, the prior austenite grain sizes and fracture morphology were investigated by SEM observation. The results show that the V-Nb inoculants obtained is amorphous and the sample steel modified by V-Nb inoculants which make it possible to be a large amount of nucleation centers existing in the form of (V, Nb)C and achieve the effect of grain refinement in the solidification stages of liquid steel has been found to have the finest prior austenite grain sizes and the average prior austenite grain sizes of steel without addition of V and Nb(Steel A), steel microalloyed with V and Nb(Steel B) and steel modified by V-Nb inoculants(Steel C) are respectively 30μm, 20μm and 10μm. Tensile behavior of samples was studied under tempering at 400°C for 30 min after quenching, tensile results show that the fracture of steel modified by V-Nb inoculants appears dimples which represent ductile fracture. However the tensile fracture of V-Nb microalloyed steel is mixture of quasi-cleavages and dimples. Under tempering at 550°C for 30 min, Steel B and Steel C both show a fractograph with cleavage fracture.

Nanostructured Strengthening of Springs and Spring Steels

2016 ◽  
Vol 870 ◽  
pp. 40-45
Author(s):  
O.I. Shavrin ◽  
A.N. Skvortsov
Keyword(s):  
Cyclic Loading ◽  
Thermal Strain ◽  
Cyclic Fatigue ◽  
Fatigue Tests ◽  
Dominant Effect ◽  
Grain Sizes ◽  
Limited Life ◽  
Spring Steels

The paper considers the problem of nanostructured strengthening of spring steels and springs, the idea of steel nanostructured strengthening determined not only by grain sizes but also by subgrain sizes is justified. Design schemes of thermal strain nanoscale substructure patterning in spring material produced by hot and cold coiling were implemented. Patterning of nanoscale substructure was experimentally proved. Strength analyses of spring steels and springs showed the dominant effect of nanoscale substructure on spring limited life increasing not less than 10 times at cyclic fatigue tests. Spring compression at cyclic loading decreases 10 times.

Effect of starting microstructure on austenite grain sizes developed after reheating of HSLA steel

2013 ◽  
Vol 30 (10) ◽  
pp. 1142-1153 ◽  
Author(s):  
S. Roy ◽  
A. Karmakar ◽  
S. Mukherjee ◽  
S. Kundu ◽  
D. Srivastava ◽  
...  
Keyword(s):  
Hsla Steel ◽  
Grain Sizes ◽  
Austenite Grain

scholarly journals Influence of Austenite Grain Size on Mechanical Properties after Quench and Partitioning Treatment of a 42SiCr Steel

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 577 ◽  
Author(s):  
Sebastian Härtel ◽  
Birgit Awiszus ◽  
Marcel Graf ◽  
Alexander Nitsche ◽  
Marcus Böhme ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Heating Rates ◽  
Austenite Grain Size ◽  
Grain Sizes ◽  
Austenite Grain ◽  
Martensitic Microstructure ◽  
Pre Treatment ◽  
Uneven Heating ◽  
Upsetting Test

This paper examines how the initial austenite grain size in quench and partitioning (Q-P) processes influences the final mechanical properties of Q-P steels. Differences in austenite grain size distribution may result, for example, from uneven heating rates of semi-finished products prior to a forging process. In order to quantify this influence, a carefully defined heat treatment of a cylindrical specimen made of the Q-P-capable 42SiCr steel was performed in a dilatometer. Different austenite grain sizes were adjusted by a pre-treatment before the actual Q-P process. The resulting mechanical properties were determined using the upsetting test and the corresponding microstructures were analyzed by scanning electron microscopy (SEM). These investigations show that a larger austenite grain size prior to Q-P processing leads to a slightly lower strength as well as to a coarser martensitic microstructure in the Q-P-treated material.

scholarly journals ANALYSIS OF HEAT TREATMENT EFFECT ON MICROSTRUCTURAL FEATURES EVOLUTION IN A MICRO-ALLOYED MARTENSITIC STEEL

2016 ◽  
Vol 22 (4) ◽  
pp. 266 ◽  
Author(s):  
Andrea Di Schino
Keyword(s):  
Prior Austenite ◽  
Martensitic Steel ◽  
High Angle Boundary ◽  
Packet Size ◽  
Tempering Temperature ◽  
Grain Sizes ◽  
Austenite Grain ◽  
Heat Treated ◽  
Micro Alloyed Steel ◽  
Prior Austenite Grain

<p>The microstructural evolution of a quenched and tempered medium-C micro-alloyed steel during tempering is analyzed The steel was heat treated in order to develop fully martensitic microstructures after quenching with different prior austenite grain sizes (AGS).</p><p>Main results can be summarized as below:</p><ul><li>A very poor effect of AGS on packet size is found.</li><li>High-angle boundary grains do not significantly grow after tempering; on the contrary, low-angle grain boundaries (cells) move, fully justifying the hardness evolution with tempering temperature. </li></ul>

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