公开(公告)号：US20120251377A1

公开(公告)日：2012-10-04

申请号：US13074652

申请日：2011-03-29

Applicant: Kuen-Shyang Hwang ,  Li-Hui Cheng ,  Yung-Chung Lu

Inventor： Kuen-Shyang Hwang ,  Li-Hui Cheng ,  Yung-Chung Lu

IPC: C22C1/05

CPC classification number: C22C33/0285 ,  B22F1/0011 ,  B22F3/16 ,  B22F2201/30 ,  B22F2998/10 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  C22C38/48 ,  C22C38/58 ,  C23C8/02 ,  C23C8/22 ,  B22F2201/013 ,  B22F2201/20

Abstract: A method for enhancing strength and hardness of powder metallurgy stainless steels comprises steps of fabricating a stainless steel powder into a green compact; placing the green compact in a reducing environment and maintaining the green compact at a sintering temperature to form a sintered body; and placing the sintered body in a carbon-bearing atmosphere and maintaining the sintered body at a carburizing temperature below 600° C. to implant carbon atoms into the sintered body and form carburized regions in the sintered body. Thereby, the strength and hardness of powder metallurgy stainless steels can be improved. As the carburizing temperature is lower than 600° C., chromium would not react with carbon. Therefore, the strength and hardness of powder metallurgy stainless steels can be enhanced and the superior corrosion resistance is still preserved.

Abstract translation: 一种提高粉末冶金不锈钢的强度和硬度的方法包括将不锈钢粉末制成生坯的步骤; 将生坯压坯放置在还原环境中并在烧结温度下保持生坯成型以形成烧结体; 将烧结体置于含碳气氛中，将烧结体保持在600℃以下的渗碳温度，将碳原子注入到烧结体中，在烧结体中形成渗碳区域。 因此，可以提高粉末冶金不锈钢的强度和硬度。 渗碳温度低于600℃时，铬不会与碳反应。 因此，可以提高粉末冶金不锈钢的强度和硬度，并且仍然保持优异的耐腐蚀性。

公开(公告)号：US08540825B2

公开(公告)日：2013-09-24

申请号：US13074742

申请日：2011-03-29

Applicant: Kuen-Shyang Hwang ,  Li-Hui Cheng ,  Yung-Chung Lu

Inventor： Kuen-Shyang Hwang ,  Li-Hui Cheng ,  Yung-Chung Lu

IPC: C23C8/22 ,  C22C38/18 ,  C22C38/36

CPC classification number: C23C8/02 ,  C23C8/22

Abstract: A low-temperature stainless steel carburization method comprises steps: providing a stainless steel material; placing the stainless steel material in a halogen-free reducing environment and maintaining the stainless steel at a first temperature ranging 1,050 to 1,400° C.; and placing the stainless steel material in a carbon-bearing atmosphere and maintaining the stainless steel material at a second temperature lower than 600° C. to implant carbon atoms into the stainless steel material to form a carburized layer on the surface of the stainless steel material. A halide-bearing gas or solution is not to be applied to activate the passivation layer, so the fabrication cost would be reduced and the safety of carburization process would be enhanced. Besides, the environment can be prevented from halide pollution.

Abstract translation: 低温不锈钢渗碳方法包括以下步骤：提供不锈钢材料; 将不锈钢材料放置在无卤素还原环境中，并将不锈钢保持在1,050至1400℃的第一温度。 并将不锈钢材料放置在含碳气氛中，并将不锈钢材料保持在低于600℃的第二温度，以将碳原子注入到不锈钢材料中，以在不锈钢材料的表面上形成渗碳层 。 不施加卤化物气体或溶液以激活钝化层，因此将降低制造成本并提高渗碳过程的安全性。 此外，可以防止环境污染卤化物。

公开(公告)号：US08608868B2

公开(公告)日：2013-12-17

申请号：US13081960

申请日：2011-04-07

Applicant: Kuen-Shyang Hwang ,  Li-Hui Cheng ,  Yung-Chung Lu ,  Yang-Liang Fan ,  Po-Han Chen

Inventor： Kuen-Shyang Hwang ,  Li-Hui Cheng ,  Yung-Chung Lu ,  Yang-Liang Fan ,  Po-Han Chen

IPC: C23C8/22 ,  C23C8/30

CPC classification number: C23C8/22 ,  C23C8/02 ,  C23C8/32 ,  C23C8/34

Abstract: A method for improving surface mechanical properties of non-austenitic stainless steels comprises steps of: providing a non-austenitic stainless steel material; placing the non-austenitic stainless steel material in an environment containing at least one austenite-stabilizing element, and implanting the austenite-stabilizing elements into a surface of the non-austenitic stainless steel material to form a modified layer enriched with the austenite-stabilizing elements; and placing the non-austenitic stainless steel material in a carbon-bearing atmosphere to make the modified layer in contact with the carbon-bearing atmosphere, and maintaining the non-austenitic stainless steel material at a carburizing temperature below 600° C. to implant carbon into the modified layer to form a carburized layer. The carburized layer enhances the surface hardness of the non-austenitic stainless steel material and enables it to apply to decorative components or structural components demanding high abrasion resistance, high surface hardness, and high corrosion resistance.

Abstract translation: 一种改善非奥氏体不锈钢表面机械性能的方法，包括以下步骤：提供非奥氏体不锈钢材料; 将非奥氏体不锈钢材料放置在含有至少一种奥氏体稳定元素的环境中，并将奥氏体稳定元素注入非奥氏体不锈钢材料的表面，以形成富含奥氏体稳定元素的改性层 ; 并将非奥氏体不锈钢材料放置在含碳气氛中，使改性层与含碳气氛接触，并将非奥氏体不锈钢材料保持在低于600℃的渗碳温度下，以植入碳 进入改性层以形成渗碳层。 渗碳层增强了非奥氏体不锈钢材料的表面硬度，使其能够应用于要求高耐磨性，高表面硬度和高耐腐蚀性的装饰部件或结构部件。

公开(公告)号：US20120255652A1

公开(公告)日：2012-10-11

申请号：US13081960

申请日：2011-04-07

Applicant: Kuen-Shyang HWANG ,  Li-Hui CHENG ,  Yung-Chung LU ,  Yang-Liang FAN ,  Po-Han CHEN

Inventor： Kuen-Shyang HWANG ,  Li-Hui CHENG ,  Yung-Chung LU ,  Yang-Liang FAN ,  Po-Han CHEN

IPC: C23C8/34

CPC classification number: C23C8/22 ,  C23C8/02 ,  C23C8/32 ,  C23C8/34

Abstract: A method for improving surface mechanical properties of non-austenitic stainless steels comprises steps of: providing a non-austenitic stainless steel material; placing the non-austenitic stainless steel material in an environment containing at least one austenite-stabilizing element, and implanting the austenite-stabilizing elements into a surface of the non-austenitic stainless steel material to form a modified layer enriched with the austenite-stabilizing elements; and placing the non-austenitic stainless steel material in a carbon-bearing atmosphere to make the modified layer in contact with the carbon-bearing atmosphere, and maintaining the non-austenitic stainless steel material at a carburizing temperature below 600° C. to implant carbon into the modified layer to form a carburized layer. The carburized layer enhances the surface hardness of the non-austenitic stainless steel material and enables it to apply to decorative components or structural components demanding high abrasion resistance, high surface hardness, and high corrosion resistance.

Abstract translation: 一种改善非奥氏体不锈钢表面机械性能的方法，包括以下步骤：提供非奥氏体不锈钢材料; 将非奥氏体不锈钢材料放置在含有至少一种奥氏体稳定元素的环境中，并将奥氏体稳定元素注入非奥氏体不锈钢材料的表面，以形成富含奥氏体稳定元素的改性层 ; 并将非奥氏体不锈钢材料放置在含碳气氛中，使改性层与含碳气氛接触，并将非奥氏体不锈钢材料保持在低于600℃的渗碳温度下，以植入碳 进入改性层以形成渗碳层。 渗碳层增强了非奥氏体不锈钢材料的表面硬度，使其能够应用于要求高耐磨性，高表面硬度和高耐腐蚀性的装饰部件或结构部件。

公开(公告)号：US20120247620A1

公开(公告)日：2012-10-04

申请号：US13074742

申请日：2011-03-29

Applicant: Kuen-Shyang Hwang ,  Li-Hui Cheng ,  Yung-Chung Lu

Inventor： Kuen-Shyang Hwang ,  Li-Hui Cheng ,  Yung-Chung Lu

IPC: C23C8/22

CPC classification number: C23C8/02 ,  C23C8/22

Abstract: A low-temperature stainless steel carburization method comprises steps: providing a stainless steel material; placing the stainless steel material in a halogen-free reducing environment and maintaining the stainless steel at a first temperature ranging 1,050 to 1,400° C.; and placing the stainless steel material in a carbon-bearing atmosphere and maintaining the stainless steel material at a second temperature lower than 600° C. to implant carbon atoms into the stainless steel material to form a carburized layer on the surface of the stainless steel material. A halide-bearing gas or solution is not to be applied to activate the passivation layer, so the fabrication cost would be reduced and the safety of carburization process would be enhanced. Besides, the environment can be prevented from halide pollution.

Abstract translation: 低温不锈钢渗碳方法包括以下步骤：提供不锈钢材料; 将不锈钢材料放置在无卤素还原环境中，并将不锈钢保持在1,050至1400℃的第一温度。 并将不锈钢材料放置在含碳气氛中，并将不锈钢材料保持在低于600℃的第二温度，以将碳原子注入到不锈钢材料中，以在不锈钢材料的表面上形成渗碳层 。 不施加卤化物气体或溶液以激活钝化层，因此将降低制造成本并提高渗碳过程的安全性。 此外，可以防止环境污染卤化物。