公开(公告)号：US20160114462A1

公开(公告)日：2016-04-28

申请号：US14923878

申请日：2015-10-27

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Laszlo J. Kecskes ,  Micah J. Gallagher ,  Anthony J. Roberts ,  Heather A. Murdoch ,  Kristopher A. Darling

IPC: B24C1/10

CPC classification number: B24C1/10 ,  B24C7/0007 ,  C21D7/06 ,  C21D8/00

Abstract: Nanostructured or ultra-fine grained metallic systems according to embodiments of the invention may be formed of: pure Cu, pure Fe, or pure Ti, with grain sizes of less than 140 nm, 348 nm, or 59 nm, respectively. The metallic systems demonstrate a monotonically increasing grain size dependence from a minimum value attained at the surface; and a converse relation of microhardness, decreasing from 160 kg/mm2, 265 kg/mm2, or 320 kg/mm2, respectively. The grain refinement process at cryogenic conditions relies on the suppression of room temperature dislocation-mediated deformation mechanisms which facilitate grain restructuring, relaxation, and reorientation. At the cryogenic conditions, alternative mechanism for grain refinement, such as shear localization or dynamic recrystallization may be more dominant. Processes for refining the grain size of these metallic systems may include: subjecting metal plates to a high-energy milling process using a high-energy milling device to impart high impact energies to its surface. Due to the high-efficiency of this attrition process, these metallic systems are ideal candidates for improved corrosion and wear resistance.

Abstract translation: 根据本发明的实施方案的纳米结构或超细晶粒金属体系可以分别由具有小于140nm，348nm或59nm的晶粒尺寸的纯Cu，纯Fe或纯Ti形成。 金属系统表现出从表面达到的最小值单调递增的晶粒尺寸依赖性; 和显微硬度的相关关系，分别从160 kg / mm2，265 kg / mm2或320 kg / mm2下降。 低温条件下的晶粒细化过程依赖于抑制室温位错介导的变形机制，促进晶粒重组，松弛和重新取向。 在低温条件下，晶粒细化的替代机理如剪切定位或动态重结晶可能更为主导。 用于精炼这些金属体系的晶粒尺寸的方法可以包括：使用高能铣削装置对金属板进行高能量铣削加工，以赋予其表面高的冲击能。 由于这种磨损过程的高效率，这些金属系统是改善耐腐蚀和耐磨性的理想选择。

公开(公告)号：US20230279525A9

公开(公告)日：2023-09-07

申请号：US17886949

申请日：2022-08-12

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： John J. PITTARI, III ,  Steven M. Kilczewski ,  Jeffrey J. Swab ,  Kristopher A. Darling ,  Billy C. Hornbuckle ,  Heather A. Murdoch ,  Robert J. Dowding

IPC: C22C29/02 ,  B22F3/105 ,  C22C29/08 ,  B22F3/14 ,  C22C29/06 ,  C22C1/051

CPC classification number: C22C29/02 ,  B22F3/105 ,  C22C29/08 ,  B22F3/14 ,  C22C29/067 ,  C22C1/051

Abstract: A sintered cemented carbide body including tungsten carbide, and a substantially cobalt-free binder including an iron-based alloy sintered with the tungsten carbide. The iron-based alloy is approximately 2-25% of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may be approximately 90 wt % and the iron-based alloy may be approximately 10 wt % of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may comprise a substantially same size before and after undergoing sintering. The iron-based alloy may be sintered with the tungsten carbide using a uniaxial hot pressing process, a spark plasma sintering process, or a pressureless sintering process. The sintered tungsten carbide and iron-based alloy has a hardness value of at least 15 GPa and a fracture toughness value of at least 11 MPa√m.

公开(公告)号：US20180142331A1

公开(公告)日：2018-05-24

申请号：US15807604

申请日：2017-11-09

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： John J. Pittari, III ,  Steven M. Kilczewski ,  Jeffrey J. Swab ,  Kristopher A. Darling ,  Billy C. Hornbuckle ,  Heather A. Murdoch ,  Robert J. Dowding

IPC: C22C29/02

CPC classification number: C22C29/02 ,  B22F3/105 ,  B22F3/14 ,  C22C1/051 ,  C22C29/067 ,  C22C29/08

Abstract: A sintered cemented carbide body including tungsten carbide, and a substantially cobalt-free binder including an iron-based alloy sintered with the tungsten carbide. The iron-based alloy is approximately 2-25 % of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may be approximately 90 wt % and the iron-based alloy may be approximately 10 wt % of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may comprise a substantially same size before and after undergoing sintering. The iron-based alloy may be sintered with the tungsten carbide using a uniaxial hot pressing process, a spark plasma sintering process, or a pressureless sintering process. The sintered tungsten carbide and iron-based alloy has a hardness value of at least 15 GPa and a fracture toughness value of at least 11 MPa√m.

公开(公告)号：US20230160042A1

公开(公告)日：2023-05-25

申请号：US17886949

申请日：2022-08-12

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： John J. PITTARI, III ,  Steven M. Kilczewski ,  Jeffrey J. Swab ,  Kristopher A. Darling ,  Billy C. Hornbuckle ,  Heather A. Murdoch ,  Robert J. Dowding

IPC: C22C29/02 ,  B22F3/105 ,  C22C29/08 ,  B22F3/14 ,  C22C29/06 ,  C22C1/051

CPC classification number: C22C29/02 ,  B22F3/105 ,  C22C29/08 ,  B22F3/14 ,  C22C29/067 ,  C22C1/051

Abstract: A sintered cemented carbide body including tungsten carbide, and a substantially cobalt-free binder including an iron-based alloy sintered with the tungsten carbide. The iron-based alloy is approximately 2-25% of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may be approximately 90 wt % and the iron-based alloy may be approximately 10 wt % of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may comprise a substantially same size before and after undergoing sintering. The iron-based alloy may be sintered with the tungsten carbide using a uniaxial hot pressing process, a spark plasma sintering process, or a pressureless sintering process. The sintered tungsten carbide and iron-based alloy has a hardness value of at least 15 GPa and a fracture toughness value of at least 11 MPa√m.

公开(公告)号：US20200024702A1

公开(公告)日：2020-01-23

申请号：US16587724

申请日：2019-09-30

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： John J. Pittari, III ,  Steven M. Kilczewski ,  Jeffrey J. Swab ,  Kristopher A. Darling ,  Billy C. Hornbuckle ,  Heather A. Murdoch ,  Robert J. Dowding

IPC: C22C29/08 ,  C22C1/05

Abstract: A sintered cemented carbide body including tungsten carbide, and a substantially cobalt-free binder including an iron-based alloy sintered with the tungsten carbide. The iron-based alloy is approximately 2-25% of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may be approximately 90 wt % and the iron-based alloy may be approximately 10 wt % of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may comprise a substantially same size before and after undergoing sintering. The iron-based alloy may be sintered with the tungsten carbide using a uniaxial hot pressing process, a spark plasma sintering process, or a pressureless sintering process. The sintered tungsten carbide and iron-based alloy has a hardness value of at least 15 GPa and a fracture toughness value of at least 11 MPa√m.

公开(公告)号：US11725262B2

公开(公告)日：2023-08-15

申请号：US17886949

申请日：2022-08-12

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： John J. Pittari, III ,  Steven M. Kilczewski ,  Jeffrey J. Swab ,  Kristopher A. Darling ,  Billy C. Hornbuckle ,  Heather A. Murdoch ,  Robert J. Dowding

IPC: C22C29/02 ,  B22F3/105 ,  C22C29/08 ,  B22F3/14 ,  C22C29/06 ,  C22C1/051

CPC classification number: C22C29/02 ,  B22F3/105 ,  B22F3/14 ,  C22C1/051 ,  C22C29/067 ,  C22C29/08

Abstract: A sintered cemented carbide body including tungsten carbide, and a substantially cobalt-free binder including an iron-based alloy sintered with the tungsten carbide. The iron-based alloy is approximately 2-25% of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may be approximately 90 wt % and the iron-based alloy may be approximately 10 wt % of the overall weight percentage of the sintered tungsten carbide and iron-based alloy. The tungsten carbide may comprise a substantially same size before and after undergoing sintering. The iron-based alloy may be sintered with the tungsten carbide using a uniaxial hot pressing process, a spark plasma sintering process, or a pressureless sintering process. The sintered tungsten carbide and iron-based alloy has a hardness value of at least 15 GPa and a fracture toughness value of at least 11 MPa√m.