公开(公告)号：US5571345A

公开(公告)日：1996-11-05

申请号：US268696

申请日：1994-06-30

申请人： Swami Ganesh ,  Eric S. Huron

发明人： Swami Ganesh ,  Eric S. Huron

IPC分类号： B22F3/24 ,  C22F1/10

CPC分类号： B22F3/24 ,  C22F1/10 ,  Y10S148/902

摘要： A method is provided for obtaining a uniform grain size on the order of about ASTM 5 or coarser in at least a portion of an article formed from a .gamma.' precipitation strengthened nickel-base superalloy. The method comprises forming an article by: providing a billet, preheating the billet above 2000.degree. F. for at least 0.5 hours, working at least a portion to near-net shape at working conditions including a first strain rate of less than about 0.01 per second and at a subsolvus temperature at or near the recrystallization temperature, supersolvus heating to form a grain size in the portion of at least 5 ASTM, and cooling to reprecipitate .gamma.' within the article. The method can be utilized to form a .gamma.' precipitation strengthened nickel-base superalloy article whose grain size varies uniformly between portions thereof, so as to yield a desirable microstructure and property gradient in the article in accordance with the in-service temperature and stress-state gradient experienced by the article. The method is particularly useful for the making of relatively large components such as turbine disks used in gas turbine engines, which are subjected to stress and temperature conditions that vary radially from the center of the disk to its outer rim.

摘要翻译： 提供了一种方法，用于在由γ'沉淀强化的镍基超级合金形成的制品的至少一部分中获得大约为ASTM 5或更粗的大小的均匀晶粒尺寸。 该方法包括通过以下步骤来形成物品：提供坯料，将坯料预热到2000°F以上至少0.5小时，在包括第一应变速率小于约0.01的工作条件下工作至少一部分至接近净形状 第二和在重结晶温度或接近重结晶温度的亚沉积温度下，加热至少5 ASTM部分中的晶粒尺寸，并冷却以在制品内再沉淀γ'。 该方法可用于形成晶粒尺寸在其各部分之间均匀变化的γ'沉淀强化镍基超合金制品，从而根据使用中的温度和应力 - 压力产生所需的微结构和性能梯度， 文章经历的状态渐变。 该方法特别适用于制造相对较大的部件，例如在燃气涡轮发动机中使用的涡轮盘，其经受从盘的中心到其外缘径向变化的应力和温度条件。

公开(公告)号：US5584948A

公开(公告)日：1996-12-17

申请号：US308187

申请日：1994-09-19

申请人： Eric S. Huron

发明人： Eric S. Huron

IPC分类号： C22C19/05 ,  C22F1/10

CPC分类号： C22F1/10 ,  C22C19/056

摘要： A method is provided for reducing the tendency for thermally induced porosity within a .gamma.' precipitation strengthened nickel-base superalloy which has been processed to obtain a uniform and coarse grain microstructure. This method is particularly useful for forming components such as gas turbine compressor and turbine disk assemblies in which optimal mechanical properties, such as low cycle fatigue and creep resistance, are necessary for operating at elevated temperatures within a gas turbine engine. The method generally entails alloying a .gamma.' precipitation strengthened nickel-base superalloy to have a boron content of not more than about 0.02 weight percent, and then forming a billet by melting an ingot of the superalloy in an argon gas atmosphere and atomizing the molten superalloy using argon gas. The above atomizing technique encompasses both powder metallurgy and spray forming processes.

摘要翻译： 提供了一种减少伽马沉淀强化的镍基超级合金中热致孔隙度的方法，该镍基超级合金已被加工以获得均匀且粗糙的微观结构。 该方法对于形成诸如燃气轮机压缩机和涡轮盘组件的部件特别有用，其中在燃气涡轮发动机内的升高的温度下操作需要最佳机械性能，例如低循环疲劳和抗蠕变性。 该方法通常需要将γ'沉淀强化的镍基超级合金合金化以使硼含量不超过约0.02重量％，然后通过在氩气气氛中熔化超合金的锭并使熔融的超合金雾化而形成坯料 使用氩气。 上述雾化技术包括粉末冶金和喷射成型工艺。

公开(公告)号：US06521175B1

公开(公告)日：2003-02-18

申请号：US09021040

申请日：1998-02-09

申请人： David P. Mourer ,  Eric S. Huron ,  Kenneth R. Bain ,  Enrique E. Montero ,  Paul L. Reynolds ,  John J. Schirra

发明人： David P. Mourer ,  Eric S. Huron ,  Kenneth R. Bain ,  Enrique E. Montero ,  Paul L. Reynolds ,  John J. Schirra

IPC分类号： C22C1905

CPC分类号： C22C19/057 ,  B22F2998/10 ,  C22C1/0441 ,  C22C19/056 ,  B22F3/17 ,  B22F9/082 ,  B22F3/02 ,  B22F3/20

摘要： A superalloy has a composition of, in weight percent, from about 16.0 percent to about 22.4 percent cobalt, from about 6.6 percent to about 14.3 percent chromium, from about 1.4 percent to about 3.5 percent tantalum, from about 1.9 percent to about 4.0 percent tungsten, from about 1.9 percent to about 3.9 percent molybdenum, from about 0.03 percent to about 0.10 percent zirconium, from about 0.9 percent to about 3.0 percent niobium, from about 2.4 percent to about 4.6 percent titanium, from about 2.6 percent to about 4.8 percent aluminum, from 0 to about 2.5 percent rhenium, from about 0.02 percent to about 0.10 percent carbon, from about 0.02 percent to about 0.10 percent boron, balance nickel and minor amounts of impurities. The superalloy is advantageously utilized in aircraft gas turbine disks.

摘要翻译： 超级合金的重量百分比为约16.0％至约22.4％的钴，约6.6％至约14.3％的铬，约1.4％至约3.5％的钽，约1.9％至约4.0％的钨 ，约1.9％至约3.9％的钼，约0.03％至约0.10％的锆，约0.9％至约3.0％的铌，约2.4％至约4.6％的钛，约2.6％至约4.8％的铝 ，0至约2.5％的铼，约0.02％至约0.10％的碳，约0.02％至约0.10％的硼，余量为镍和少量杂质。 超级合金有利地用于飞机燃气轮机盘。

公开(公告)号：US5529643A

公开(公告)日：1996-06-25

申请号：US323969

申请日：1994-10-17

申请人： Duk Y. Yoon ,  Aldo E. Murut ,  Michael F. Henry ,  Renee M. Rohling ,  Charles P. Blankenship ,  Mark G. Benz ,  Edward L. Raymond ,  Eric S. Huron

发明人： Duk Y. Yoon ,  Aldo E. Murut ,  Michael F. Henry ,  Renee M. Rohling ,  Charles P. Blankenship ,  Mark G. Benz ,  Edward L. Raymond ,  Eric S. Huron

IPC分类号： C22F1/10

CPC分类号： C22F1/10

摘要： A method is provided for obtaining uniform grain growth within .gamma.' precipitation strengthened nickel-base superalloys. The method includes forming a billet having a very fine grain size in order to achieve optimum superplasticity of the superalloy during forging. The article is then heated to a pre-working hold temperature in a manner which prevents coarsening of the microstructure and a loss of superplasticity. The article is then worked, such as by forging, at a temperature below the .gamma.' solvus temperature of the alloy, so as to maintain local strain rates within the article below a critical strain rate for random grain growth, and so as to maintain the strain rate gradient throughout the article below a critical upper limit. After working, the article is subjected to annealing at a temperature which is less than the .gamma.' solvus temperature of the alloy, and for a duration which is sufficient to remove accumulated metallurgical strain in the article. A supersolvus heat treatment is then performed by further heating the article to a temperature above the .GAMMA.' solvus temperature of the superalloy for a duration sufficient to uniformly coarsen the grains of the article.

摘要翻译： 提供了一种在γ'沉淀强化镍基超级合金中获得均匀晶粒生长的方法。 该方法包括形成具有非常细晶粒度的坯料，以便在锻造期间达到超合金的最佳超塑性。 然后将制品以防止微结构粗化和超塑性损失的方式加热到预加工保持温度。 然后将该制品例如通过锻造在低于合金的γ'固溶温度的温度下加工，以使得该制品内的局部应变速率低于随机晶粒生长的临界应变速率，并且保持 整个制品的应变速率梯度低于临界上限。 加工后，制品在比合金的γ'溶解温度低的温度下进行退火，持续时间足以清除制品中累积的冶金应变。 然后通过将制品进一步加热到超过合金的GAMMA'solvus温度的温度持续足以均匀地粗化制品的颗粒的时间来进行超溶解热处理。

公开(公告)号：US5891272A

公开(公告)日：1999-04-06

申请号：US704221

申请日：1996-08-23

申请人： Edward L. Raymond ,  Robert D. Kissinger ,  Allen J. Paxson ,  Eric S. Huron

发明人： Edward L. Raymond ,  Robert D. Kissinger ,  Allen J. Paxson ,  Eric S. Huron

IPC分类号： C22C19/05 ,  C22F1/10

CPC分类号： C22C19/056 ,  C22F1/10

摘要： A .gamma.' precipitation strengthened nickel-base superalloy provided in powder metal or cast and wrought form and alloyed to minimize nucleation tendencies and control grain growth. The superalloy includes a fine dispersion of a second phase in sufficient amounts to prevent critical grain growth in the superalloy when the superalloy is subjected to temperatures above its .gamma.' solvus temperature. The superalloy preferably contains at least about 0.030 weight percent carbon or about 27 to about 2000 ppm yttrium in order to produce a volume fraction of the second phase which is sufficient to cover a minimum of about 10 percent of the grain boundary area. The fine dispersion of the second phase restricts the grain boundary motion of the alloy during supersolvus heat treatment, thereby preventing random grain growth during supersolvus heat treatment and yielding a microstructure whose grain size is uniform, for example, having a grain size range of about 2 to about 3 ASTM units and being substantially free of random grain growth in excess of about 2 ASTM units coarser than the desired grain size range.

摘要翻译： 一种γ'沉淀强化的镍基超级合金，以粉末金属或铸造和锻造形式提供，合金化以最小化成核倾向并控制晶粒生长。 超合金包括足够量的第二相的细分散体，以防止超合金在高于其γ'固溶体温度的温度下超临界晶界生长。 超合金优选含有至少约0.030重量％的碳或约27至约2000ppm的钇，以便产生第二相的体积分数，其足以覆盖至少约百分之十的晶界面积。 第二相的细分散限制了超溶热处理期间合金的晶界运动，从而防止了在超溶解热处理期间的随机晶粒生长，并产生了晶粒尺寸均匀的微结构，例如晶粒尺寸范围为约2 至约3个ASTM单位，并且基本上不含超过所需晶粒尺寸范围粗大约2个ASTM单元的随机晶粒生长。

公开(公告)号：US5584947A

公开(公告)日：1996-12-17

申请号：US293343

申请日：1994-08-18

申请人： Edward L. Raymond ,  Robert D. Kissinger ,  Allen J. Paxson ,  Eric S. Huron

发明人： Edward L. Raymond ,  Robert D. Kissinger ,  Allen J. Paxson ,  Eric S. Huron

IPC分类号： C22C19/05 ,  C22F1/10

CPC分类号： C22C19/056 ,  C22F1/10

摘要： A method is provided for obtaining uniform grain growth within .gamma.' precipitation strengthened nickel-base superalloys provided in powder metal or cast and wrought form. The method includes alloying the nickel-base superalloy to contain a minimum calculated amount of carbon which, when finely dispersed within the alloy using suitable processing methods, yields a sufficient amount of carbide phase which restricts the grain boundary motion of the alloy during supersolvus heat treatment. When appropriately processed, the grains are not permitted to grow randomly during supersolvus heat treatment, making possible a microstructure whose grain size is uniform, having a grain size range of about 2 to about 3 ASTM units and being substantially free of random grain growth in excess of about 2 ASTM units coarser than the desired grain size range.

摘要翻译： 提供了一种在粉末金属或铸造和锻造形式提供的γ'沉淀强化镍基超级合金中获得均匀晶粒生长的方法。 该方法包括将镍基超级合金合金化以含有最小计算量的碳，当使用合适的加工方法在合金中精细分散时，产生足够量的碳化物相，其限制了在超溶解热处理期间合金的晶界运动 。 当适当加工时，不允许晶粒在超溶解热处理期间随机生长，使得其晶粒尺寸均匀的微结构可能具有约2至约3 ASTM单位的晶粒尺寸范围并且基本上不含任意晶粒生长过量 约2个ASTM单位比期望的晶粒尺寸范围粗。