公开(公告)号：EP2757170B1

公开(公告)日：2018-06-13

申请号：EP12831846.6

申请日：2012-03-14

Applicant: Usui Kokusai Sangyo Kaisha Ltd. ,  Shinshu University

Inventor： SUGIMOTO Koh-ichi ,  KOBAYASHI Junya ,  YOSHIKAWA Nobuo ,  NAKAJIMA Yuji ,  TAKAHASHI Teruhisa ,  ARAI Goro

IPC: C22C38/00 ,  C22C38/38 ,  C22C38/58 ,  C21D7/13 ,  C21D9/00 ,  C21D1/22 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  F16C7/02 ,  C21D8/00 ,  C21D1/18

CPC classification number: F16C7/023 ,  C21D1/18 ,  C21D1/22 ,  C21D7/13 ,  C21D8/005 ,  C21D9/0068 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/38 ,  C22C38/58 ,  Y10T74/2162

Abstract: Provided is a TRIP-aided dual-phase martensitic steel which is excellent in terms of strength-elongation balance and Charpy impact value and has dual-phase martensite composed of a soft lath martensitic structure and a hard lath martensitic structure as a matrix phase, regardless of forging temperature or forging reduction ratio, by controlling heat treatment conditions. The dual-phase martensitic steel contains 0.1-0.7%C, 0.5-2.5%Si, 0.5-3.0%Mn, 0.5-2.0%Cr, 0.5% or less (including 0%) of Mo, 0.04-2.5%Al, and the balance Fe with incidental impurities; has its metallographic structure in which a matrix phase is composed of a soft lath martensitic structure and a hard lath martensitic structure; and obtained by heating its raw steel material to a ³-range, rapidly cooling the heated material to a temperature slightly above a martensite transformation starting temperature (Ms), and then performing an isothermal transformation process the cooled material in the temperature range from Mf to [(Mf)-100°C].

公开(公告)号：EP2757170A1

公开(公告)日：2014-07-23

申请号：EP12831846.6

申请日：2012-03-14

Applicant: Usui Kokusai Sangyo Kaisha Ltd. ,  Shinshu University

Inventor： SUGIMOTO Koh-ichi ,  KOBAYASHI Junya ,  YOSHIKAWA Nobuo ,  NAKAJIMA Yuji ,  TAKAHASHI Teruhisa ,  ARAI Goro

IPC: C22C38/00 ,  C22C38/38 ,  C22C38/58

CPC classification number: F16C7/023 ,  C21D1/18 ,  C21D1/22 ,  C21D7/13 ,  C21D8/005 ,  C21D9/0068 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/38 ,  C22C38/58 ,  Y10T74/2162

Abstract: Provided is a TRIP-aided dual-phase martensitic steel which is excellent in terms of strength-elongation balance and Charpy impact value and has dual-phase martensite composed of a soft lath martensitic structure and a hard lath martensitic structure as a matrix phase, regardless of forging temperature or forging reduction ratio, by controlling heat treatment conditions. The dual-phase martensitic steel contains 0.1-0.7%C, 0.5-2.5%Si, 0.5-3.0%Mn, 0.5-2.0%Cr, 0.5% or less (including 0%) of Mo, 0.04-2.5%Al, and the balance Fe with incidental impurities; has its metallographic structure in which a matrix phase is composed of a soft lath martensitic structure and a hard lath martensitic structure; and obtained by heating its raw steel material to a γ-range, rapidly cooling the heated material to a temperature slightly above a martensite transformation starting temperature (Ms), and then performing an isothermal transformation process the cooled material in the temperature range from Mf to [(Mf)-100°C].

Abstract translation: 提供了一种TRIP辅助双相马氏体钢，其强度 - 伸长率平衡和夏比冲击值优异，并且具有由软质板条马氏体结构和硬质板条马氏体组织构成的双相马氏体作为基体相，不管 的锻造温度或锻造减速比，通过控制热处理条件。 双相马氏体钢含有0.1-0.7％C，0.5-2.5％Si，0.5-3.0％Mn，0.5-2.0％Cr，0.5％或更少（包括0％）的Mo，0.04-2.5％的Al和 余量Fe伴有杂质; 具有金相组织，其中基体相由软质板条马氏体结构和硬质板条马氏体结构组成; 通过将其原料钢加热至3范围，将加热的材料快速冷却至略高于马氏体相变开始温度（Ms）的温度，然后在冷却材料的温度范围为Mf至 [（MF）-100℃]。