Understanding The Six(6) Strengthening Mechanisms in Metals & Alloys скачать в хорошем качестве

Understanding The Six(6) Strengthening Mechanisms in Metals & Alloys

Strengthening mechanism also known as the metal hardening process is any type of method used to increase the hardness, tensile strength, and yield strength of the metal by prohibiting the mobility of numerous dislocations. These strengthening mechanisms give engineers the ability to tailor the mechanical properties of the metal to suit a variety of different applications. The six main types of strengthening mechanisms are: 1. Grain size reduction. 2. Solid solution strengthening. 3. Precipitation hardening. 4. Dispersion hardening. 5. Strain hardening. 6. Martensitic hardening. ▶ Grain size reduction: During the plastic deformation, the mobility of the dislocation will take place across the grain boundary between the two grains. The size of the grains or average grain diameter in a polycrystalline metal influences the mechanical properties of the metal. This is because of the different crystallographic orientations and common grain boundaries. ▶ Solid solution strengthening: The solid solution technique works by adding an atom of one element (the alloying element) to the crystalline lattice of the base metal, resulting in either substitutional or interstitial point defects in the crystal. The solute atoms cause lattice distortion that impedes dislocation motion, increasing the yield stress of the metal. ▶ Precipitation hardening Precipitation hardening also known as age hardening, is a thermal process that increases the yield strength of malleable alloys. The mechanism involves precipitation of fine-grained particles within the matrix of the original alloy. This occurs when a super-saturated solid solution has been rapidly cooled and a second phase comes out of the solution. ▶ Dispersion hardening: Dispersion hardening refers to a method of strengthening an alloy by adding some very stable substances (called dispersive particles) to the alloy and distributing these substances evenly in the alloy. These particles are typically larger than those in precipitation hardening. ▶ Strain hardening: Strain hardening also known as work hardening or cold working is a process in which the strength of a metal is achieved by plastic deformation. ▶ Martensitic hardening: The martensitic formation is undoubtedly one of the most impressive strengthening mechanisms in steels. The intense stress field around the carbon atoms in martensite effectively hinders the motion of dislocations. All these are discussed in the video. If you find the video useful, like and share the video. Subscribe to the channel🙏 -    / @jamesswordengineering   Watch this video on surface hardening -    • Surface Hardening Process | A Complete Gui...   Watch more videos from this playlist -    • Physical Metallurgy   #Metalhardening #strengtheningmechanism #Strengthofmetal