添加500 ppm M最佳工艺制备的Al-Ti-Nb-B细化剂后,Al-10Si合金的晶粒细化到133±10 μm,与纯Nb粉制备的Al-Ti-Nb-B细化剂效果相当(125±8 μm),抗拉强度和伸长率分别为158.6±2.7 MPa和7.8%±1.1%,与未添加时相比提高了...
原料的称量;b.TiNbB中间合金的熔炼;c.AlTiNbB细化剂的熔炼.一种应用AlTiNbB细化剂于铸造铝硅合金的方法和步骤为:a.熔化铝硅合金;b.加入AlTiNbB细化剂;c.浇铸.本发明制备的AlTiNbB细化剂可将铝硅合金中的αAl的晶粒尺寸细化至150~450微米;大幅减少Nb含量,降低了原料成本;保证了制备AlTiNbB细化剂的成分及...
本发明公开了一种铸造铝硅合金用Al‑Ti‑Nb‑B细化剂的制备方法,包括以下步骤:a.原料的称量;b.Al‑Ti‑Nb‑B细化剂的熔炼。本发明制备的Al‑Ti‑Nb‑B细化剂以Nb2O5作为Nb源的引入,大幅降低了原料成本;在制备效果上,可将铝硅合金中的α‑Al的晶粒尺寸细化至220微米,满足工业认可标准。Nb通...
另外,本发明还公开了制备该Nb-Si-Ti-B-Al-Cr复合材料的方法,该方法为:一、将硅粉、钛粉、硼粉、铝粉、铬粉和铌粉置于球磨机中混合均匀,烘干后粉碎得到混合粉料;二、将混合粉料置于热压烧结炉进行热压烧结,得到Nb-Si-Ti-B-Al-Cr复合材料。本发明Nb-Si-Ti-B-Al-Cr复合材料具有高强度、高韧性和高温抗氧化...
In this paper, quantitative two-dimensional (2-D) phase-field simulations were performed to gain insight into the effects of B and Nb for Al-Ti-Nb balanced-ratio GH4742 alloys. The microstructure evolution during the precipitation process was simulated using the MICRESS (MICRostructure Evolution Si...
304不锈钢是按照美国ASTM标准生产出来的不锈钢的一个牌号.304相当于我国的0Cr19Ni9 (0Cr18Ni9)不锈钢.304含铬19%,含镍9%. 304是得到最广泛应用的不锈钢、耐热钢.用于食品生产设备、昔通化工设备、核能等. 304不锈钢化学成份 规格C Si Mn P S Cr Ni(镍) Mo SUS431 ≤0.08 ≤1.00 ≤2.00 ≤0.05 ≤...
48Al + (Nb, Ti)B - High Temperature Aluminides and Intermetallics - Microstructures of Nb−26TiThe microstructures of Nb–26at.%Ti–48at.%Al + 10vol.%(Nb,Ti)B prior to and after creep testing were studied by transmission electron microscopy. The matrix of this alloy exhibits a γ +...
本文通过Nb2O5替代Nb粉制备的Al-Ti-Nb-B细化剂可以将Al-10Si合金的晶粒尺寸细化至133±10 µm,其抗拉强度和伸长率分别为158.6 MPa和7.8%,相比未添加细化剂时分别提高了21.1%和178.6%。由Nb2O5引入的氧元素大部分随浮渣被除去,少部分以Al2O3的形式存在于细化剂中,并可作为异质形核颗粒。在Al-Ti-Nb-B...
(7)铌/钶(Nb/Cb) 铌与钶常和钽共生,它们在钢中的作用相近。铌和钽部分溶入固溶体,起固溶强化作用。溶入奥氏体时显著提高钢的淬透性。但以碳化物和氧化物微粒形式存在时,细化晶粒并降低钢的淬透性。它能增加钢的回火稳定性...
Regularities of cold uniaxial deformation of powder materials consisting of Ti-B and Ti-Al-Nb-Mo-B layers are established based on a rheological approach. The composition TiB-Ti (30 wt.%) (TiB) was chosen for the Ti-B layer; 51.85Ti-43Al-4Nb-1Mo-0.15B (at%) (TNM), for the inter...