Lower yield strength

Fine-grain, carbon-manganese steels of the same type and with identical properties are standardized in France and Italy — A52 and 20 M5, respectively. The Swedish and British equivalents have somewhat lower yield strengths, and in these countries there is more interest in niobium-treated, fine-grain, high-strength steel. 

Lower yield strength when compared to Inconel 625. 

Compared to steel and titanium, aluminum has lower yield strength so if strength is important to a design, aluminum would not be a good choice. 

The AFM phase images revealed that the nanostrips were just under the tribofilm surface and were more easily mechanically deformed because of their lower hardness than that of the surrounding surface material. Because the height and phase contrasts from most of the nanostrips decreased and even disappeared when Ag was continuously increased to Aq = 900 mV, the nanostrips were found to be present at a depth of around 10 nm from the top surface. Moreover, because the nanostrips exhibited irreversible deformation, they were concluded to have lower yield strength than that of the surface material around the nanostrips. 

They are almost completely elastic until the upper yield strength Ren (UYS) is reached. At this stress, plastic deformation sets in rather suddenly, which is localised in so-called Liiders bands or flow lines. While the stress oscillates, these lines extend until they cover the whole specimen. The lowest stress occurring during this process is called lower yield strength i eL (lys). Why this localised plastic deformation occurs, will be explained in section 6.4.3. After the specimen has plastified completely, it behaves identical to a metal without apparent yield point. 

Fig. 6.36. Dependence of the lower yield strength on the grain size in a low-alloy steel at room temperature (after [68])...

If the load is removed and the material stored for some time, the dissolved atoms diffuse again to the dislocations and thus re-anchor them. If the material is deformed again, an upper and lower yield strength are again encountered. This is called strain ageing. The temperature and time required for this ageing... 

Reh lower yield strength of materi- melting temperature... 

The 0.21 % C steel had a normalizing treatment while the 0.45 % C after normalizing was quenched and tempered. The mechanical properties were 324 and 750 MPa lower yield strength, 498 and 833 MPa ultimate strength and 978 and 1,510 MPa true fracture strength for the 0.21 and 0.45 % C steel, respectively. It can be seen the excellent grain refinement of the heat-treated 0.45 % C steel that had a Vickers hardness of 270 Hv and grain size much smaller compared to the... 

It is clear from Tabs. 1-3 that the PP has equal stffiiess, slightly lower yield strength, much higher ductile-biittle transition and much higher impact resistance than a PP. The fi PP has also lower moldings volumetric shrinkage than a PP as its density (0.889 g / cm ) is lower than a PP (0.902 g / cm ). 

The cadmium-free jewelry brazes generally exhibit lower yield strength and enhanced ductility, which makes them more amenable to drawing to fine wire when in the form of a filler metal as well as to further mechanical working operations of a part-fabricated jewelry item. The designation... 

---