Chapter V Conclusion
5.1 stainless steel solution treatment
The solution treated with SUS316L stainless steel is a metastable or unstable austenite. Under heat, diffusion-controlled desolvent precipitation will occur. Solution treatment: 1050 ° C for 11 min, then water quenching "after the solution treatment, the internal structure of the sample is uniform, the grain size is moderate, the ferrite content is reduced, and the mechanical properties are obviously improved. The tensile test after solid solution The fracture shows obvious ductile fracture, and the toughness is significantly higher than that of the hot rolled product. Increasing the solution heat treatment temperature of stainless steel and accelerating the cooling rate can reduce the tendency of intergranular corrosion and improve the corrosion resistance. If the solution treatment temperature is too high, the tensile strength and hardness of the steel will be lowered.
5.2 stainless steel aging treatment
After aging at 600 °C and 650 °C, precipitation of M23C6 carbides occurs in the interior of the austenite grains and in the crystal defects. The carbides are thin rods with small size; compared with the solution treatment, after the aging treatment of stainless steel The hardness is higher, the needle-like structure is produced from the grain boundary to the crystal, and some regular precipitates in the crystal are formed, which is due to age hardening.
At the same aging time. The hardness of stainless steel increases first and then decreases with the increase of the aging temperature. The hardness value is the highest when the aging temperature is 900 °C, which indicates that the most sensitive temperature of the hardened phase is precipitated during the aging treatment of stainless steel. Under the same conditions, the hardness of stainless steel decreased significantly with the aging treatment time.
Related information recommended:
Solid solution and aging of stainless steel - overview (1)
Solid solution and aging of stainless steel - testing equipment (2)
Solid solution and aging of stainless steel - process flow (3)
Solid solution and aging of stainless steel - test data and phase diagram (4)
references:
[1] Gan Junmin, 316L steel and its application [J] Petrochemical Equipment Technology, 1992, 13(4): 57-60
[2]Song Renbo, Xiang Jianying, Hou Dongpo, et al. Thermal processing hardening behavior and mechanism of 316L stainless steel[J], Acta Metall Sin, 2010, 46(1): 57-61
[3] Du Cunchen, Application of Austenitic Stainless Steel in Industry, Chemical Equipment and Pipeline, 2003;
( 2) : 4-8
[4] Wang Wei. Austenitic stainless steel tube solution treatment device and its control system simulation [D]. Lanzhou University of Technology, 2003.
[5] Hou Dongpo, Song Renbo, Xiang Jianying, Chen Shuyang, Ren Peidong, Effect of solution treatment on microstructure and properties of 316L stainless steel, Journal of Materials and Heat Treatment, 2010, 12; 31-12
[6] Liu Xiaoping, Tian Wenhuai, Yang Feng, Guo Chaoli, aging treatment of crystal structure and chemical composition of precipitated phase in SUS316L stainless steel, Journal of High Raw Material Heat Treatment 2006,6;27-3
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