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METHOD FOR DERIVING COOLING TIME WHEN QUENCHING STEEL MATERIAL, METHOD FOR QUENCHING STEEL MATERIAL, AND METHOD FOR QUENCHING AND TEMPERING STEEL MATERIAL
METHOD FOR DERIVING COOLING TIME WHEN QUENCHING STEEL MATERIAL, METHOD FOR QUENCHING STEEL MATERIAL, AND METHOD FOR QUENCHING AND TEMPERING STEEL MATERIAL
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机译：淬火钢材料时的冷却时间的求取方法，淬火钢材料的方法以及对钢材进行淬火和回火的方法
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摘要
Provided are a method for deriving a cooling time when quenching a steel material, a method for quenching a steel material and a method for quenching and tempering a steel material. The method for deriving a cooling time comprises: step A of cooling a test specimen heated to a cooling initiation temperature Ts under a cooling condition C and measuring the cooling time t until the temperature of a center portion of the test specimen reaches a cooling termination temperature Te; step B of determining a function f which is defined by t = f(V/S) and which is satisfied by data including the volume V, the surface area S and the cooling time t of the test specimen obtained in step A; and step C of substituting the volume V1 and the surface area S1 of the shape F1 of a steel material to be actually quenched in the relational expression t = f(V/S), and calculating a cooling time t1. The method for quenching a steel material comprises: actually heating the steel material to be quenched to the cooling initiation temperature Ts; cooling only for the cooling time t1 under the cooling condition C; and then stopping cooling under the cooling condition C. The method for quenching and tempering a steel material comprises tempering the steel material quenched by this method.
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