subscribe aimami and get the latest technological updates every day also press this bell icon so you won't miss any of my latest videos hi guys welcome back to aimami so guys in this video we are going to learn about the last type of annealing that is diffusion annealing so guys the alloy steels engorged to reduce the dendritic and intercrystalline segregation so this increases the susceptibility of steels subjected to the brittle failure okay due to the dendritic and intercrystalline segregation so dendritic is nothing but the having like you know branch like structure so this is something like just like similar to trees okay so to reduce that the diffusion annealing is carried out which is also known as the homogenization of steels so guys this dendritic structure okay this reduces the ductility and a toughness of alloy steel so in order to increase the ductility and toughness we have to do this diffusion annealing and which reduces this particular dendritic structure so hence the larger castings are homogenized in many cases so guys let us understand the process of this diffusion annealing okay guys so there are three stages guys mainly as we have seen in our last videos so the first one is the heating so followed by the heating the holding stage is carried out and the last one and the third one is nothing but the cooling stage so this is similar to the full annealing or the process annealing also so the first one is heating so this process in this the heated up to it is the steels are heated up to 1100 to 1200 degree Celsius which is at the highest temperature in the heat treatment at this temperature the composition becomes homogeneous and the second one is the holding so this is keeping at the constant temperature such as constant temperature for the period of something around 8 to 20 hours so it it is very time-consuming process guys so this time depends upon the composition of steel basically the composition also and the mass of the charge okay and the last one is the cooling process so guys in this cooling which is done at normally at the room temperature guys so guys this is the image which is clearly shown such as the process diffusion annealing stage okay guys so let us understand the applications of the annealing process so guys this chart shows the applications of annealing like in which application which kind of annealing is suitable suppose the application is of steel castings the properties which gets disturbed and the type of process which is used which is shown in this table such as this for steel casting having non-uniform grain structure and it enters a structured it is get altered by the process of full annealing so guys you can refer this chart and you can understand the various applications of annealing okay guys so you can do this so applications so guys we have learned in this video the process of diffusion annealing we have seen this three stages in the diffusion annealing process and we have seen the applications of various annealing processes so guys we have completed annealing over here thank you for watching my video guys please do not forget to subscribe to my channel thank you guys

在本視頻中，我們將學習到最後一種退火方式，即擴散退火，合金鋼為減少樹枝狀偏析和晶間偏析而進行充填退火。樹枝狀結構就是像樹枝一樣的結構，所以就像樹一樣，為了減少這種情況，就要進行擴散退火，也就是所謂的鋼材均勻化。是以，讓我們瞭解一下擴散退火的過程，主要分為三個階段，正如我們在上一個視頻中所看到的，第一個階段是加熱，加熱之後是保溫階段，最後一個也就是第三個階段是冷卻階段。第一道工序是加熱，將鋼材加熱至 1100 至 1200 攝氏度，這是熱處理的最高溫度，在此溫度下，鋼材成分會變得均勻。最後一個是冷卻過程，通