Strengthening by cold-working

The austenitic structure can be strengthened by cold work, and high strengths, still with adequate ductility, can be obtained by cold rolling, drawing or stretching. The power requirement for such strengthening... 

Commercially pure aluminum has a tensile strength of 69 MPa (10,000 IbFin ), but it can be strengthened by cold working. One limitation of aluminum is that strength declines greatly above 150°C (300°F). When strength is important, 200°C (400°F) is usually considered the highest permissible safe temperature for aluminum. However, aluminum has excellent low-temperature properties it can be used at -250°C (-420°F). 

Grade B8 class 2 (304 stainless steel strengthened by cold work)... 

Hardenable describes alloys that can be hardened and strengthened by cold working, for example, strain-hardened bolting. Hardenability describes the ability of an alloy to be hardened and strengthened, usually by heat treatments such as quenching and tempering. 

Relationship of Composition and Heat Treatment to Environment-Sensitive Cracking of Aluminum Alloys. Those aluminum alloys strengthened by cold working only, particularly the 1000-series alloys, do not develop susceptibility to SCC. The so-called high-strength alloys are strengthened by thermal/mechanical treatments, which result in solid-state precipitation of one or more intermetallic phases that restrict dislocation motion and, hence, increase strength. Their susceptibility to SCC varies extensively with alloy composition and the thermal/mechanical treatment. While susceptibility tends to increase with... 

Figure 9.24). For austenitic stainless steels, the anstenite (or y) phase field is extended to room temperatnre. Ferritic stainless steels are composed of the a-ferrite (BCC) phase. Anstenitic and ferritic stainless steels are hardened and strengthened by cold work becanse they are not heat-treatable. The anstenitic stainless steels are the most corrosion resistant becanse of the high chrominm contents and also the nickel additions they are prodnced in the largest qnantities. Both martensitic and ferritic stainless steels are magnetic the anstenitic stainlesses are not. 

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