The Hardness Changing Regularity of Quenched-Steel in Tempering Process and Its Double-Exponential Model
The transformation of tempering for quenched steel corresponded to complicated process of phase transformation, and mechanical properties of quenched-and-tempered steel were related to the phase transformation. In practice, hardness test was adopted to judge whether the properties of tempered-parts qualified because of its facility. Numerous researches indicated that, there existed correlativity expressed by different function forms between tempering hardness of quenched-steel and its tempering parameters. However, considering physical metallurgy of tempering process, the adoption of double-exponential function would help to describe regularity of hardness changing more exactly for quenched-steel during tempering process. Additionally, results of hardness tests for isothermal tempering and molding/simulation researches have shown that, the model of double-exponential function, which can reflect decline law of tempering hardness for quenched-steel, would provide basis for optimization design of tempering parameters, performance prediction of tempered-parts, and energy-saving heat-treatment on tempering process.
Sihai Jiao, Zhengyi Jiang and Jinglong Bu
C. S. Guo et al., "The Hardness Changing Regularity of Quenched-Steel in Tempering Process and Its Double-Exponential Model", Advanced Materials Research, Vols. 146-147, pp. 1578-1582, 2011