Case hardening and through-hardening tend to improve the hardness of the material to a great extent, thereby increasing the materialâs wear-resistance property. The only criterion that plays an important role in heat treatment is the presence of carbon in steels and other ferrous meta… Depending on the purpose and effect to be achieved, different annealing methods can be used: Low-temperature annealing (some also called incomplete annealing) can also be used. Depending on the aging temperature, the dispersion and particle size of the precipitates are different, and they have different mechanical properties. For this reason, according to the characteristic that C changes with temperature in austenite, that is, the solubility is large at high temperatures, and the solubility is small at low temperatures. The most trusted source for guidance on heat treating of irons and steels. The amount of carbon present in the steel determines the type of heat treatment that can be carried out on it. Medium and high carbon steels can be through-hardened and surface hardened by using surface hardening methods. The cooling rate has no major influence on the stabilization effect. Under higher temperature conditions (such as casting or forging), the amount of ferrite increases. The main purpose is to reduce brittleness and improve resistance to intergranular corrosion. It is not possible to make the austenite grains coarser or the presence of ferrite or retained austenite in the structure after quenching.
Precipitation hardening stainless steel is relatively late in development, and it is a kind of stainless steel that has been tested, summarized and innovated in human practice. Parameters like toughness, tensile strength, wear resistance, etc. Therefore, the steel is filled with elements Ti and Nb, which have a stronger affinity for Cr and C, and conditions are created to make C preferentially combine with Ti and Nb to reduce the chance of combining C with Cr. Information is presented by alloy group in the datasheet format established in the companion edition on irons and steels. In addition to having a little strengthening effect, it is detrimental to corrosion resistance, especially when C and Cr form carbides, the effect is even worse, so it should try to reduce its existence.
Generally, the content of Cr is 17~30%, and the content of Ni is 3~13%. This is because, at this temperature, the Cr atoms in the ferrite will rearrange to form a small Cr-rich region, which is coherent with the parent phase, causing lattice distortion, generating internal stress, and increasing the hardness and brittleness of the steel. Heat treatment of martensitic stainless steel can not only change the mechanical properties, but also have different effects on the corrosion resistance. are greatly improved due to the heat treatment process. The cooling method after tempering can generally be air cooling, but for steel grades with a tendency to temper brittleness, such as 1Cr17Ni2, 2Cr13 and 0Cr13Ni4Mo etc., it is best to use oil cooling after tempering.
① Martensitic precipitation hardening stainless steel and its heat treatment. Tempering is an important process in heat treatment that eliminates the brittleness in the material after other heat treatment processes and provides a uniform grain structure of the material. These structures tend to develop a good amount of internal stress due to the intensive welding carried out on them. After re-strengthening by aging, it reduces processing costs and outperforming martensitic steels. All Rights Reserved. Content includes chemical composition, similar U.S. and foreign alloys, characteristics, and recommended heat treating procedures. 2.