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为研究热处理参数对高速钢淬回火后奥氏体晶粒度的影响,进行了一系列的实验。实验所用钢种是T1,TA,M2,M42,其化学成份、临界点和热处理后情况见表1、表2。四种钢的倾向相同,本文只详细讨论T1钢的结果。采用两种热处理方法进行实验。一种是回火退火处理(见图1);另一种是相变退火处理(见图2)。回火退火处理是在A_3点(865℃)以上的较低温度(900—1000℃)预奥氏体化一小时,油淬后在低子A_1(825℃)以下温度(712°—798℃)等温12小时,然后空冷;相变退火处理是在A_3点以上的较低温度(865°—890℃)预奥氏体化一小时,炉冷到A_1点以下
In order to study the influence of heat treatment parameters on austenite grain size after quenching and tempering of HSS, a series of experiments were carried out. The experimental steel used is T1, TA, M2, M42, its chemical composition, the critical point and heat treatment in Table 1, Table 2. The tendency of the four kinds of steel is the same, this article only discussed in detail the results of T1 steel. Two kinds of heat treatment methods were used for experiments. One is tempering annealing (see Figure 1); the other is phase-change annealing (see Figure 2). Tempering annealing is pre-austenitizing at a lower temperature (900-1000 ° C) above the A_3 point (865 ° C) for one hour and after oil quenching at a temperature below the lower sub A_1 (825 ° C) (712 ° -798 ° C ) Isothermal 12 hours, and then air-cooled; phase change annealed at a lower temperature above A_3 (865 ° -890 ° C) pre-austenitizing an hour, the furnace cooled to below A_1