The heat treatment process of Si Mn alloyed ductile iron is similar to that of other ductile iron, which can be generally divided into three stages: heating, quenching, tempering or isothermal. The heating process curve is shown in Figure 1. The heating at the low temperature stage shall be...
In the heat treatment process after large-scale production of steel materials, quenching treatment and tempering treatment are the most common and important means in the heat treatment process. After quenching, the hardness of the material structure will be improved, but the newly formed martensite structure will be “very brittle”,...
Connecting rod is an important part of diesel engine. The surface quality, such as quenching cracks, directly causes the scrapping of parts. However, the internal quality, such as structure, performance and micro cracks, is not easy to be found in production, but may cause serious consequences. The connecting rod...
Decarburization refers to the phenomenon that CO2, H2O, O2, H2 and other gases in the heating medium interact with the carbon in the steel surface layer with oxidizing impurities, so that part or all of the carbon is oxidized. The decarburized surface layer is called decarburized layer. It is...
In the situation of fierce market competition, under the premise of ensuring product quality, energy saving and consumption reduction is an important means for enterprises to improve economic benefits. No matter whether quenching + high temperature tempering or energy-saving waste heat quenching + high temperature tempering are used, the...
No matter whether quenching + high temperature tempering or energy-saving waste heat quenching + high temperature tempering are used, the microstructure defects of parts are inevitable due to improper process or operation during the heat treatment of quenched and tempered steel. The microstructure defect of steel after heat treatment...
Effect of chemical composition on mechanical properties Although the steel of the same brand will appear in production, some chemical composition elements are the upper limit, especially the carbon element is the upper limit; Some chemical elements are the lower limit, especially carbon. Although they are all within the...
At present, there are two typical ways of connection between quenching and tempering steel connecting rod forging and heat treatment process. Quenching and tempering is the final heat treatment. The main links of the process are: blanking → die forging → air cooling → normalizing → air cooling →...
When mastering, producing and applying such new materials, especially under the condition of mass continuous production, the main obstacle encountered is the lack of regular research on the hot forging processing parameters and the recrystallization law of deformed austenite during cooling after hot deformation, as well as the continuous...
The product quality of quenched and tempered steel connecting rod is mainly determined by the technical parameters such as quenched and tempered hardness, quenching hardness, metallographic structure and mechanical properties. In order to ensure the safety of use, the connecting rod must be quenched and tempered. The forging of...