surface-hardening steel
81Milling cutter — Milling cutters are cutting tools typically used in milling machines or machining centres (and occasionally in other machine tools). They remove material by their movement within the machine (e.g., a ball nose mill) or directly from the cutter s… …
82Hydrogen damage — is the generic name given to a large number of metal degradation processes due to interaction with hydrogen.Hydrogen is present practically everywhere, in the atmosphere, several kilometres above the earth and inside the earth. Engineering… …
83international relations — a branch of political science dealing with the relations between nations. [1970 75] * * * Study of the relations of states with each other and with international organizations and certain subnational entities (e.g., bureaucracies and political… …
84Types of concrete — There are many types of concrete, variations of installation, composition, finish and performance characteristics. A highway paved with concrete …
85Annealing (metallurgy) — Annealing, in metallurgy and materials science, is a heat treatment wherein a material is altered, causing changes in its properties such as strength and hardness. It is a process that produces conditions by heating to above the recrystallization …
86Plasticity (physics) — Plastic material redirects here. For the material used in manufacturing, see Plastic. Continuum mechanics …
87Plasterwork — refers to construction or ornamentation done with plaster, such as a layer of plaster on an interior wall or plaster decorative moldings on ceilings or walls. This is also sometimes called pargeting. The process of creating plasterwork, called… …
88iron processing — Introduction use of a smelting process to turn the ore into a form from which products can be fashioned. Included in this article also is a discussion of the mining of iron and of its preparation for smelting. Iron (Fe) is a… …
89Knife — A knife is a handheld sharp edged instrument consisting of handle attached to a blade used for cutting. The knife is a tool that can be used as a weapon. Its origins date as far back as two and a half million years ago, as evidenced by the… …
90Repoussé and chasing — Chased and chasing redirect here. For other uses, see Chase (disambiguation). The Great Dish, or Great Plate of Bacchus, from the Roman Mildenhall Treasure …
