Effect of quenching temperature on microstructure and properties of M390 powder metallurgical stainless steel for chopping knives and scissors

doi:10.13251/j.issn.0254-6051.2022.04.032

Abstract

Abstract: Through calculation of equilibrium phases at different temperatures and carrying out vacuum quenching+low temperature tempering for powder metallurgical stainless steel M390, the effect of quenching temperature on microstructure and mechanical properties of the steel was analyzed. The results show that with the increase of quenching temperature, the size of carbides in the tempered M390 steel increases, the number of carbide particles per unit area decreases but the area fraction increases, thus the distribution uniformity of carbide decreases. Meanwhile, the hardness increases first and then decreases slightly, reaching the maximum value of 60.2 HRC after quenching at 1130 ℃ and decreases to 58.5 HRC after tempering. However, the flexural strength is little affected by quenching temperature, which is at the level of 4000 MPa. In order to obtain good properties, the quenching temperature should be controlled below 1200 ℃. In conclusion, vacuum gas quenching at 1130-1180 ℃ and tempering at 200 ℃ is the optimum heat treatment process for the M390 steel used for chopping knives and scissors.

Key words: M390 powder metallurgical steel, quenching temperature, materials for chopping knives and scissors, microstructure, mechanical properties

CLC Number:

TG146

Liu Wenbin, Qiao Longyang, Pan Xinyu, Cheng Ge, Li Aina, Pei Xinjun. Effect of quenching temperature on microstructure and properties of M390 powder metallurgical stainless steel for chopping knives and scissors[J]. Heat Treatment of Metals, 2022, 47(4): 189-195.

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