According to our experience, it generally selects heating temperature in the range of 980~1020℃. In order to improve the strength and hardness of the matrix, it needs to be heated again to 750-950°C for insulation. Heating and cooling do not occur when the phase change, which can not use heat treatment methods to strengthen, and it has the advantages of low strength, high plasticity and high toughness. This structure also has good corrosion resistance. Heating temperature is low, C-Cr carbide can not be fully dissolved, the temperature is too high, there is also the grain growth, reduce corrosion resistance problems. The heating temperature for a solid solution is 1040℃, and the austenite is obtained by water cooling or oil cooling after heating and holding, and the hardness is about 150HB; It adjusts the treatment temperature to 760℃, air cooling after heat preservation, which is to precipitate alloy carbides in austenite, reduce the stability of austenite, increase the Ms point to about 50-90℃, and obtain lath martensite after cooling.
It has better corrosion resistance in organic acids and poor corrosion resistance in sulfuric acid, hydrochloric acid and other media. When heating to above 925°C and rapidly cooling down, compounds such as Cr, C, and N will precipitate in the grains and grain boundaries, which causes increased brittleness and intergranular corrosion. Depending on the aging temperature, the dispersion and particle size of the precipitates are different, and they have different mechanical properties.
In China and some other national standards, it is indicated as “quick cooling” after solid solution, and the scale of “quick” can be grasped according to the following circumstances. C content <0.08%, size <3mm, can be air-cooled; The effective size ≤ 0.5mm can be air-cooled. The amount of carbon present in the steel determines the type of heat treatment that can be carried out on it.
If austenitic steel is heated in the range of 500-900°C for a long time, or when Ti, Nb, Mo and other elements are added to the steel, the σ-phase will be precipitated, which will increase the brittleness and reduce the corrosion resistance of the steel. The app can be used by itself or as a companion to the ASM Heat Treater's Guide print and online database products, which provide additional heat treating data such as representative micrographs, isothermal transformation diagrams, cooling transformation diagrams, tempering curves and data on dimensional change. However, sometimes this method is not allowed, such as pipe fittings in the loop, finished workpieces with no margin, and easily deformable parts with particularly complex shapes. If you experience problems with access, please contact our Member Service Center at firstname.lastname@example.org.
The formation of σ phase is related to the composition, except Cr, Si, Mn and Mo, etc. Isothermal annealing, which can replace complete annealing to achieve the purpose of complete annealing. When the Cr-rich area is formed, there must be a Cr-poor area, which has an adverse effect on the corrosion resistance. If the workpiece is used in a strong stress corrosion environment and the stress must be completely eliminated. that can age precipitate precipitates. Day to day developments are making heat treatment processes more dependable. Duplex stainless steel is a new member of the stainless steel family and developed late, but its characteristics have been widely recognized and valued. Heat Treatment of Ferritic-Austenitic Duplex Stainless Steel, 5. 5. These are basically due to the composition of the material and to the metallurgical alteration of its properties. For example, cutting tools, bearings and wear parts etc. Carburizing is a method of increasing the carbon content in a material by inducing carbon into it. After aging at 490℃, the hardness is 485HB and σb is 1850 N/mm2. This isothermal annealing is also an effective way to improve the poor structure after forging and improve the mechanical properties after quenching and tempering, especially the impact toughness. The most trusted source for guidance on heat treating of irons and steels.
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