Metallic hot-working (anneal, quench, temper) principle knowledge

Anneal can change the constituent structure of steel, acquire the property that we ask thereby.

(1) .

The constituent change: when heating? Wetting  rainwaters in puddles  drips? of Ш of Xian Huan of arenaceous rate of abb of blade of bank of τ of Wa of Gou of paper of Chen of afterwards of thoroughfare Qian  does not break dimple of the  that steal straightforward advice grown, disappear entirely till pearlite,

(2) .

The constituent change: when refrigeration? Mu Cong of Lu of hoarse of instruct of take along sth to sb this Yu group the organization of child of change of austenite of Qi Hao? and Fe-Fe3C is same, consequently eutectoid steel is pearlite; inferior eutectoid steel adds ferrite; to cross eutectoid steel to add cementite for pearlite for pearlite.

2.

Quenching is heat steel critical temperature above, heat preservation period of time, cool quickly next come down, have the heat treatment method of hard work of temper by dipping in water.

It is the ferrite in making through heating steel organizes a structure and pearlite character actually sufficient change is the austenite with even composition, next urgent cold come down to get the martensite with very tall hardness.

3.

Temper is back-to-back at quenching the heat treatment working procedure later, quench steel issues temper in different temperature, the organization of earning is different, difference of its machinery function is very consequently big, is total trend: ? Snipe of widow vomit Tao shows its intensity of Ren  ? , hardness to reduce, and plasticity, tenacity rises. Quench the martensite in steel and leftover austenite are not stable organization, heat to be able to produce change. Lift as temperature, carbon is atomic gradually the formal separate out with cementite, cause constituent change. Final cementite is aggregate and go up in ferrite matrix dispersedly, form all sorts of temper organizations. CNC Milling CNC Machining