公开(公告)号：JP2006348385A

公开(公告)日：2006-12-28

申请号：JP2006177981

申请日：2006-06-28

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： YAMADA KATSUMI ,  OKADA KOICHI ,  MUNEKI MASAICHI ,  ABE FUJIO

IPC: C22C38/00 ,  C22C38/54

Abstract: PROBLEM TO BE SOLVED: To provide an MX carbonitride precipitation-strengthened heat-resistant steel which is a heat-resistant steel utilizing a strengthening mechanism by the precipitation of carbonitride and in which the high-temperature creep strength at 600 to 650°C is improved. SOLUTION: The MX carbonitride precipitation-strengthened heat-resistant steel utilizes a strengthening mechanism by the precipitation of MX carbonitride and has the improved high-temperature creep strength at 600 to 650°C, wherein the content of a compound MX carbonitride comprising NbC (TaC) and VN is restricted to below 30% by weight with respect to the entire precipitated MX carbonitride. COPYRIGHT: (C)2007,JPO&INPIT

公开(公告)号：JP2003253397A

公开(公告)日：2003-09-10

申请号：JP2002104524

申请日：2002-02-28

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： YAMADA KATSUMI ,  MUNEKI MASAICHI ,  OKADA KOICHI ,  IGARASHI MASAAKI ,  ABE FUJIO

IPC: F01D5/28 ,  C22C38/00 ,  C22C38/30

Abstract: PROBLEM TO BE SOLVED: To improve a high-temperature creep property in a temperature range of 650°C or higher of a martensitic heat-resistant steel, enable the higher high- temperature creep property to be kept for a long time, make the thermal expansion characteristics in the temperature range of 650°C or higher to be low, and improve the thermal fatigue characteristics. SOLUTION: In the martensitic heat-resistant steel having a martensite single- phase structure at room temperature, in which carbides do not precipitate, a structure in the temperature range of 650°C or higher has two-phases comprising an austenitic phase of a parent phase and a finely dispersed and precipitated intermetallic compound phase, or three phases comprising the austenitic phase of the parent phase, a ferritic phase and the finely dispersed and precipitated intermetallic compound phase. COPYRIGHT: (C)2003,JPO