摘要:
Acier inoxydable martensitique, caractérisé en ce que sa composition est, en pourcentages pondéraux : 0,005% ≤ C ≤ 0,30%; 0,20% ≤ Mn ≤ 2,0%; traces % ≤ Si ≤,0%; 0,20% ≤ Mn + Si ≤ 1,5%; traces ≤ S ≤ 0,01%; 0 ≤ 10 000 x Mn x S ≤ 40; traces ≤ P ≤ 0,04%; 10,5% ≤ Cr ≤ 17,0%, avec [Cr - 10.3 - 80 x (C + N) 2 ] ≤ (Mn + Ni); traces ≤ Ni ≤ 4,0%; traces ≤ Mo ≤ 2,0%; traces ≤ Mo + 2W ≤ 2,0%; traces ≤ Cu ≤ 2,0%; traces ≤ Ti ≤ 0,5%; traces ≤ V ≤ 0,3%; traces ≤ Zr ≤ 0,5%; traces ≤ Al ≤ 0,2%; traces ≤ O ≤ 400 ppm; traces ≤ Ta ≤ 0,3%; traces ≤ Nb ≤ 0,3%; 0,25 ≤ (Nb + Ta)/(C + N) ≤ 8; Nb ≥ [1,2 (C + N) - 0,1]%; 0,009% ≤ N ≤ 0,2%; traces ≤ Co ≤ 2,0%; traces ≤ Cu + Co ≤ 2,0%;traces ≤ Cu + Co + Ni ≤ 4,0%; traces ≤ B ≤ 0,1%; traces ≤ terres rares + Y ≤ 0,06%; traces ≤ Ca ≤ 20ppm; le reste étant du fer et des impuretés résultant de l'élaboration; et en ce que sa microstructure comporte au moins 75% de martensite, au plus 20% de ferrite et au plus 0,5% de carbures, la taille des grains de ferrite étant comprise entre 4 et 80 μm, de préférence entre 5 et 40 μm. Procédé de fabrication de cet acier.
摘要:
Described are powders of nitrided inorganic materials comprising one or more phases selected from the group consisting of intermetallic phases and alloy phases, and pro- cesses for obtaining such materials.
摘要:
Articles, devices and machines are disclosed for initiating structural changes based on material magnetic properties to cause self-adjustment to improve the operation or function of structures, devices or machines. In one aspect, a device exhibiting a self-healing property to repair a damage, the device including a device structure over which magnetic microparticles are dispersed to impart a self-healing ability to enable the device structure, once damaged to have a broken portion, to self-repair based on magnetic attraction of the dispersed magnetic microparticles to cause re-attachment of the broken portion.
摘要:
A hardfacing disposable on a surface of a component, such as a wellsite component, is disclosed. The hardfacing includes a surface portion and a bottom portion with a segregation line defined therebetween. The surface portion and the bottom portion each include a matrix phase including a matrix composition made of a metal alloy and a hard phase distributed in the matrix phase. The hard phase may include an abrasion-resistant composition made of a hard material (e.g., vanadium carbide). The surface portion has a first concentration of the abrasion-resistant composition and the bottom portion has a second concentration of the abrasion-resistant composition with the first concentration being greater than the second concentration such that a wear resistant surface is defined on the surface of the component.
摘要:
十分な耐食性を有すると共に、成形後のたわみやねじれを抑制可能なフェライト系ステンレス熱延鋼板および熱延焼鈍板、ならびにそれらの製造方法を提供すること。 質量%で、C:0.005~0.060%、Si:0.02~0.50%、Mn:0.01~1.00%、P:0.04%以下、S:0.01%以下、Cr:15.5~18.0%、Al:0.001~0.10%、N:0.005~0.100%、Ni:0.1~1.0%を含有し、残部がFeおよび不可避的不純物からなり、下式(1)で算出される縦弾性率の面内異方性の絶対値が35GPa以下であるフェライト系ステンレス熱延鋼板。 |ΔE|=|(E L -2×E D +E C )/2|・・・(1) ここで、E L は圧延方向に平行な方向の縦弾性率(GPa)、E D は圧延方向に対して45°の方向の縦弾性率(GPa)、E C は圧延方向と直角方向の縦弾性率(GPa)である。