保温时间的选择原则是在正常固溶热处理温度下，使强化相达到满意的溶解程度，并使固溶体充分均匀及晶粒细小。
The selection principle of holding time is to make the strengthening phase dissolve satisfactorily at normal solution heat treatment temperature, and make the solid solution fully uniform and the grain fine.
铝合金的淬火保温时间主要是根据淬火加热温度、合金的本性、制品的种类、固溶前组织状态(强化相分布特点和尺寸大小)、产品的形状(包括断面厚度的尺寸大小)、加热方式(盐浴炉及空气循环炉，连续还是非连续加热)、加热介质、冷却方式和装炉量的多少，以及组织性能的要求等因素来确定。
The quenching holding time of aluminum alloy mainly depends on the quenching heating temperature, the nature of the alloy, the type of products, the microstructure before solution (the distribution characteristics and size of strengthening phase), the shape of the product (including the size of section thickness), the heating mode (salt bath furnace and air circulation furnace, continuous or discontinuous heating), the heating medium, the cooling mode and the amount of charging, and so on It is determined by the requirements of organization and performance.
对于同一牌号的合金，确定保温时间应考虑以下因素
For the same brand of alloy, the following factors should be considered in determining the holding time

(1)产品的形状。淬火加热时的保温时间与制品的形状(包括断面厚度的尺寸大小)有密切的关系，断面厚度越大，保温时间就相应越长。截面大的半成品及形变量小的工件，强化相较粗大，保温时间应适当延长，使强化相充分溶解。大型锻件和模锻件的保温时间比薄件的长好几倍。
(1) The shape of the product. The holding time during quenching is closely related to the shape of the product (including the size of the section thickness). The larger the section thickness is, the longer the holding time is. For semi-finished products with large cross-section and workpieces with small deformation, the strengthening phase is coarse, and the holding time should be appropriately extended to make the strengthening phase fully dissolve. The holding time of heavy forgings and die forgings is several times longer than that of thin ones.
(2)加热温度。淬火加热时的保温时间与加热温度是紧密相关的，加热温度越高，强化相溶入固溶体的速度越大，其保温时间就要短些。
(2) Heating temperature. The higher the heating temperature is, the faster the strengthening phase dissolves into the solid solution, and the shorter the holding time is.
(3)塑性变形程度及制品种类。热处理前的压力加工可加速强化相的溶解。变形程度越大，强化相尺寸越小，保温时间可短些。经冷变形的工件在加热过程中要发生再结晶，应注意防止再结晶晶粒过分粗大。固溶处理前不应进行临界变形程度的加工。挤压制品的保温时间应当缩短，以保持挤压效应。对于采用挤压变形程度很大的挤压材做毛料的模锻件，如果淬火加热的保温时间过长，将由于再结晶过程的发生，而导致局部或全部挤压效应的消失，使制品的纵向强度降低。挤压时的变形程度越大，需要保温的时间就越短。
(3) Plastic deformation degree and product type. Pressure processing before heat treatment can accelerate the dissolution of strengthening phase. The larger the deformation, the smaller the size of strengthening phase and the shorter the holding time. The recrystallization of cold deformed workpieces during heating should be avoided. The critical deformation should not be processed before solution treatment. The holding time of extruded products should be shortened to maintain the extrusion effect. If the holding time of quenching heating is too long, the partial or total extrusion effect will disappear due to the recrystallization process, and the longitudinal strength of products will be reduced. The greater the degree of deformation, the shorter the holding time.
(4)原始组织。预先经过淬火的制品，再次进行溶火加热时其保温时间可以显著缩短。而预先退火的制品与冷加工制品相比，其强化相的溶解速度显著变慢。
(4) The original organization. The heat preservation time of pre quenched products can be significantly shortened when they are heated again. However, the dissolution rate of strengthening phase of pre annealed products is significantly slower than that of cold processed products.
(5)坯料均匀化程度。均匀化不充分的制品，残留的强化相多且大，因此保温时间应长些。固溶处理和均匀化共同的目的是使强化相充分溶解，但是一般情况下，均匀化退火炉的精度较低，因此为了充分消除非平衡结晶相而提高均匀化温度就容易过烧。此外，均匀化退火时间长，经济效益低，因此可以根据制品合金本性以及加工工艺考虑均匀化和淬火的联动工艺，解决强化相充分固溶问题，因为大变形后组织中的强化相破碎严重，尺寸变小，在淬火时更容易固溶。
(5) The homogenization degree of the blank. If the homogenization is not enough, the residual strengthening phase is large, so the heat preservation time should be longer. The common purpose of solution treatment and homogenization is to make the strengthening phase fully dissolved, but in general, the accuracy of homogenization annealing furnace is low, so it is easy to overburnt in order to eliminate the non-equilibrium crystalline phase and increase the homogenization temperature. In addition, the homogenization annealing time is long and the economic benefit is low. Therefore, the linkage process of homogenization and quenching can be considered according to the nature of the product alloy and the processing technology to solve the problem of full solid solution of strengthening phase. Because the strengthening phase in the structure is seriously broken after large deformation and the size becomes smaller, it is easier to solid solution during quenching.