摘要:
'Piston rings in cast tool steels and process for the manufacture thereof', belonging to the field of piston rings of tool steel for internal combustion engines, relates to cast piston rings of tool steels the microstructure whereof is constituted by a tempered martensite matrix with precipitation of secondary M 2 C and/or MC carbides (M = V and/or Mo and/or Cr and/or W) having a typical size of between 0.5 μm and 2 μm, presenting high toughness, and by NbC eutectic carbides having cubic morphology, volumetric fraction between 1 % and 4%, typical size between 3 μm and 7 μm and homogeneous distribution, and the hardness of the material following tempering lies between 400 HV and 800 HV, having limits of chemical composition according to the table (I). The piston rings may be obtained commencing from semifinished products cast by different casting processes, preferentially casting in molds of green sand or sand-resin, casting in ceramic molds, and centrifugal casting, submitted to subsequent machining operations, and the raw materials utilized in the process of casting the semifinished product may be scrap of low alloy steels, recycled production, and ferroalloys.
摘要:
A highly impact resistant ductile iron casting is made from a specified high nickel content ductile iron composition and post-treated with a specified heating and cooling profile to achieve an elongation exceeding the ASTM A356 ("60-40-18") standard, and meeting or exceeding Charpy V Notch impact resistance at -20° F of greater than 11.0 ft 1bs.
摘要翻译:高度耐冲击的球墨铸铁由特定的高镍含量的球墨铸铁组合物制成,并用特定的加热和冷却轮廓进行后处理,以达到超过ASTM A356(“60-40-18”)标准的伸长率,并且会议 或超过夏比V -20°F时的耐冲击阻力大于11.0 ft 1bs。
摘要:
A method of forming a component includes heating the component to a burnishing temperature above 500 degrees Fahrenheit, and burnishing a surface of the component while the component is at the burnishing temperature to densify the surface. The burnishing process at an elevated temperature may be integrated into other processes, such as the sintering or heat treating processes.
摘要:
Die Erfindung betrifft ein Verfahren zum konduktiven Erwärmen eines Blechs, wobei das Blech oder zumindest ein konduktiv zu erwärmender Bereich des Blechs eine äußere Kontur hat, die rechteckförmig oder nicht rechteckförmig ist, wobei zur Durchführung der konduktiven Erwärmung wenigstens eine Elektrode mit einem Kontaktbereich in elektrischen Kontakt mit dem Blech gebracht wird und über den Kontaktbereich der elektrische Strom zur Durchführung der konduktiven Erwärmung in das Blech eingespeist und/oder aus dem Blech abgeleitet wird, wobei die Elektrode einen unebenen, strukturierten Kontaktbereich mit einer Vielzahl voneinander beabstandeter Kontaktoberflächen aufweist, durch die eine Vielzahl einzelner, voneinander beabstandeter Kontaktstellen zwischen der Elektrode und dem Blech gebildet wird. Die Erfindung betrifft außerdem eine Elektrode zum konduktiven Erwärmen eines Blechs sowie eine konduktive Erwärmungseinrichtung zur Durchführung eines Verfahrens zum konduktiven Erwärmen eines Blechs.
摘要:
A cobalt-free steel alloy comprising: (a) from 2 to 3 wt.% carbon, (b) from 4 to 6 wt.% chromium, (c) from 0.1 to 0.5 wt.% manganese, (d) from 0.1 to 0.9 wt.% silicon, (e) from 9 to 11 wt.% molybdenum, (f) from 6 to 8 wt.% vanadium, (g) optionally one or more of the following elements, from 0 to 0.3 wt.% copper, from 0 to 0.2 wt.% nickel, from 0 to 0.1 wt.% aluminium, from 0 to 0.05 wt.% phosphorus, from 0 to 0.05 wt.% sulphur, from 0 to 0.1 wt.% titanium, from 0 to 0.1 wt.% niobium, from 0 to 0.1 wt.% tantalum, from 0 to 0.1 wt.% boron, from 0 to 0.1 wt.% nitrogen, from 0 to 0.1 wt.% oxygen, from 0 to 0.1 wt.% calcium, from 0 to 0.1 wt.% tungsten, (h) the balance iron, together with unavoidable impurities.
摘要:
Apparatuses (10) for and methods of imparting a laser surface treatment to an exposed outer surface (12) of a rolling bearing component having a carbon-containing coating thereon. The apparatus (10) indudes a support housing structure (16). A rolling bearing carrier has a surface adapted to receive and engage at least one ring of a rolling bearing. A motor (22) mounted to the support housing structure (16) is coupled with the carrier and adapted for rotatably driving the carrier. A laser beam emitter aims a laser beam at an exposed surface (12) of the rolling bearing component. The carrier is rotated while the rolling bearing component is in generally opposing relationship with the laser beam so that energy from the beam causes at least a portion of the coating on the bearing component to volatilize and be removed while also causing at least a portion of a carbon content of the coating to diffuse into the bearing component.