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annealing is metal is heated to a certain temperature, keep enough time, then cooling, with appropriate speed is usually slow cooling, sometimes is to control the cooling) A kind of metal heat treatment process. The following is the purpose of annealing 1, eliminate the internal stress. 2, to reduce the hardness and improve the plastic for machining and pressure processing. 3, remove the tissue inhomogeneity, in preparation for further heat treatment. 4, refine crystal structure. 5, diffusion to air ( The main removal of hydrogen in steel) 。 Annealing process including annealing, completely, graphite spheroidizing annealing, isothermal annealing annealing, diffusion annealing, stress relieving, incomplete annealing, annealing after welding, etc. 1,, spheroidizing annealing to reduce high hardness tool steel and bearing steel forging. The workpiece heated to begin to form austenitic steel temperature above 20 ~ 40 ℃, slow cooling after heat preservation, in the process of cooling of pearlite lamellar cementite into a ball, reducing the hardness. 2, and completely annealing to refine the medium and low carbon steel after casting, forging and welding the poor mechanical properties of thick overheated structure. All into the workpiece heated to ferrite austenite temperature more than 30 ~ 50 ℃, the heat preservation for a period of time, and then with the slow cooling furnace, austenite during cooling to change again, can make the organization of the steel. 3, graphite annealing to make cast iron with plenty of cementite plastic good malleable iron. Casting process is be heated to 950 ℃ or so, appropriate cooling after heat preservation time, make cementite decomposition form flocculent mass graphite. 4, isothermal annealing to reduce some of nickel, chromium content is higher, alloy structural steel with high hardness, for machining. Generally cool at a faster pace to austenite is the most unstable temperature, heat preservation time appropriately, austenite transformed austenite or sorbite, hardness can be reduced. Recrystallization annealing to eliminate the metal wire, hardening phenomenon in the process of cold drawing, cold-rolled plate, Higher hardness, plasticity drops) 。 Heating temperature is commonly steel began to form the austenitic temperature below 50 ~ 150 ℃, only in this way can eliminate the strain hardening effect to soften a metal. 5, diffusion annealing is used to make the alloy casting chemical composition homogenization, improve its performance. Method is on the premise of not melt, will the casting temperature, heated to as high as possible and heat preservation for a long time, all sorts of elements in the alloy, slow cooling after diffusion tend to be more evenly distributed. Annealing is the main process parameters of a supreme heating temperature ( Annealing temperature) , most of the annealing temperature alloy selection is based on the phase in the alloy system, such as carbon steel with the iron carbon equilibrium graph based.
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