公开(公告)号：US5593519A

公开(公告)日：1997-01-14

申请号：US271611

申请日：1994-07-07

申请人： Charles P. Blankenship, Jr. ,  Michael F. Henry

发明人： Charles P. Blankenship, Jr. ,  Michael F. Henry

IPC分类号： C22F1/10

CPC分类号： C22F1/10

摘要： A method of supersolvus forging is described for Ni-base superalloys, particularly those which comprise a mixture of .gamma. and .gamma.' phases, and most particularly those which contain at least about 40 percent by volume of .gamma.'. The method permits the manufacture of large grain size forged articles having a grain size in the range of 50-150 .mu.m. The method comprises the selection of a fine-grained forging preform of a Ni-base superalloy. Supersolvus forging in the range of 0.degree.-100.degree. F. above the alloy solvus temperature then performed at slow strain rates in the range of 0.01-0.001 s.sup.-1. Subsequent supersolvus annealing followed by controlled cooling may be employed to control the distribution of the .gamma.', and hence influence the alloy mechanical and physical properties. The method may also be used to produce location specific grain sizes and phase distributions within the forged article.

摘要翻译： Ni基超级合金，特别是那些包含γ和γ'相的混合物，特别是含有至少约40体积％的γ'的那些的超级锻造的方法被描述。 该方法允许制造具有在50-150μm范围内的粒度的大粒度锻造制品。 该方法包括选择Ni基超级合金的细粒锻造预制件。 在合金溶剂温度以上的0〜-100°F范围内锻造锻炼，然后在0.01-0.001s-1的缓慢应变速率下进行。 随后的超溶解退火，然后控制冷却可用于控制γ'的分布，从而影响合金的机械和物理性能。 该方法还可用于在锻造制品内产生特定位置的粒度和相分布。

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：US5556484A

公开(公告)日：1996-09-17

申请号：US429506

申请日：1995-04-26

申请人： Charles P. Blankenship, Jr. ,  Duk N. Yoon ,  Michael F. Henry ,  Mark G. Benz

发明人： Charles P. Blankenship, Jr. ,  Duk N. Yoon ,  Michael F. Henry ,  Mark G. Benz

IPC分类号： C22F1/10 ,  C23C8/20

CPC分类号： C22F1/10 ,  C23C8/20

摘要： A method of forging Ni-base superalloys is described which avoids the growth of abnormally large grains in the surface region of a forged article. The method involves forging and/or annealing a Ni-base superalloy in a carburizing environment. Forging and/or annealing in a carburizing environment is done to maintain the carbon concentration in the surface region at a level that is sufficient to prevent the depletion of carbides and carbonitrides. The carburizing environment may also be selected so that it is non-oxidizing with respect to aluminum, in order to prevent the depletion of aluminum and the reduction of the .gamma.' phase in the surface region.

摘要翻译： 描述了锻造Ni基超级合金的方法，其避免了锻造制品的表面区域中异常大的颗粒的生长。 该方法包括在渗碳环境中锻造和/或退火Ni基超级合金。 进行渗碳环境中的锻造和/或退火以将表面区域中的碳浓度维持在足以防止碳化物和碳氮化物消耗的水平。 也可以选择渗碳环境使其相对于铝是非氧化的，以便防止铝的消耗和表面区域中的γ'相的减少。

公开(公告)号：US5547523A

公开(公告)日：1996-08-20

申请号：US367635

申请日：1995-01-03

申请人： Charles P. Blankenship, Jr. ,  Michael F. Henry

发明人： Charles P. Blankenship, Jr. ,  Michael F. Henry

IPC分类号： C22F1/10

CPC分类号： C22F1/10

摘要： A method of forging to impart a critical amount of retained strain is described for Ni-base superalloys, particularly those which comprise a mixture of .gamma. and .gamma.' phases, and most particularly those which contain at least about 40 percent by volume of .gamma.'. This forging method harnesses nucleation-limited recrystallization, a phenomenon which has been known in the past to produce uncontrolled, non-uniform Critical grain growth, to produce forged articles having a uniform average grain size in the range of about 90-120 microns. The method comprises the selection of a forging preform formed from a Ni-base superalloy. Isothermal subsolvus forging is then used to form a precursor forging which has a near-net shape. The precursor forging is then forged using relatively high strain rate techniques, such as hammer forging, hot die forging or room temperature forging, to impart all or some portion of it with a critical amount of retained strain energy. The forging is then given a final subsolvus soak and supersolvus anneal to form the uniform grain structure.

摘要翻译： 对于Ni基超级合金，特别是包含γ和γ'相的混合物的那些，特别是包含至少约40体积％的γ'的那些，描述了锻造赋予临界量的保留应变的方法。 这种锻造方法利用成核限制的再结晶，这是过去已知的产生不受控制的，非均匀的临界晶粒生长的现象，以产生具有在约90-120微米范围内的均匀平均晶粒尺寸的锻造制品。 该方法包括选择由Ni基超级合金形成的锻造预制件。 然后使用等温基础锻造来形成具有近净形状的前体锻造。 然后使用相对较高的应变速率技术（例如锤锻，热锻造或室温锻造）锻造前体锻造，以使其全部或部分部分具有临界量的保留的应变能。 然后锻造得到最终的浸泡和超溶解退火以形成均匀的颗粒结构。

公开(公告)号：US4055416A

公开(公告)日：1977-10-25

申请号：US651009

申请日：1976-01-21

申请人： Robert E. Oldrieve ,  Charles P. Blankenship

发明人： Robert E. Oldrieve ,  Charles P. Blankenship

IPC分类号： C22C38/26 ,  C22C38/06 ,  C22C38/48

CPC分类号： C22C38/26

摘要： Strong ferritic alloys of the Fe-Cr-Al type containing 0.4% to 2% tantalum have improved fabricability without sacrificing high temperature strength and oxidation resistance in the 800.degree. C (1475.degree. F) to 1040.degree. C (1900.degree. F) range.

摘要翻译： 含有0.4％〜2％钽的Fe-Cr-Al型强铁素体合金，在800℃（1475°F）〜1040℃（1900°F）的范围内，不牺牲高温强度和抗氧化性而提高了可制造性。