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公开(公告)号：US5413752A
公开(公告)日：1995-05-09
申请号：US957113
申请日：1992-10-07
CPC分类号： C22C1/0433 , B22F3/24 , C22F1/10
摘要： Fatigue crack growth-resistant articles are made from powder metal or cast and wrought gamma prime precipitation strengthened nickel-base superalloy material, wherein a relatively high predetermined minimum strain rate, .epsilon..sub.min, is employed during hot working at or near the alloy's recrystallization temperature; or alternatively a relatively high strain level, .epsilon..sub.min, is employed during cold or warm working at temperatures below the alloy's recrystallization temperature. The worked articles are characterized by a uniform fine grain size, and grains which coarsen uniformly after heating at the supersolvus solutioning temperature, thereby alleviating non-uniform grain growth within the material.
摘要翻译： 疲劳裂纹生长抗性制品由粉末金属或铸造和锻造的γ析出强化的镍基超合金材料制成，其中在合金的再结晶温度或接近合金的热加工期间采用相对较高的预定最小应变速率εmin; 或者在低于合金的再结晶温度的温度下，在冷或热加工期间采用相对高的应变水平，εmin。 加工制品的特征在于均匀的细粒度，以及在超溶解温度下加热后均匀地粗化的晶粒，从而减轻材料内不均匀的晶粒生长。
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2.发明授权
公开(公告)号：US5891272A
公开(公告)日：1999-04-06
申请号：US704221
申请日：1996-08-23
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。
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3.发明授权Method for forming a nickel-base superalloy having improved resistance to abnormal grain growth 失效形成具有改善的抗异常晶粒生长耐性的镍基超级合金的方法
公开(公告)号：US5584947A
公开(公告)日：1996-12-17
申请号：US293343
申请日：1994-08-18
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。
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4.发明授权Fatigue crack growth resistant nickel-base article and alloy and method for making 失效耐疲劳裂纹生长耐蚀镍基制品及其制备方法
公开(公告)号：US4957567A
公开(公告)日：1990-09-18
申请号：US284008
申请日：1988-12-13
CPC分类号： C22C19/056 , C22C1/0433 , C22F1/10
摘要： An article having improved fatigue crack growth resistance is provided through an improved nickel-base superalloy and an improved method which controls grain size and a strain rate found to be critical in processing. The alloy is selected to have a gamma prime content in the range of about 30-46 volume percent and a resistance to cracking upon rapid quenching from a selected supersolvus solutioning temperature to a selected quenching temperature. The article produced has an improved balance and combination of fatigue crack growth resistance and tensile, creep, and stress rupture properties.
摘要翻译： 通过改进的镍基超级合金提供了具有改善的耐疲劳裂纹扩展性的制品，以及控制晶粒尺寸和发现在加工中至关重要的应变率的改进方法。 该合金被选择为具有约30-46体积％范围内的γ'含量，并且在从选择的超溶液温度快速淬火至选定的淬火温度时具有抗开裂性。 所制造的制品具有改善的平衡性和疲劳裂纹扩展性与拉伸，蠕变和应力破裂性能的组合。
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