Rolling and Partitioning法で製造される1,500 MPa級超高強度薄鋼板の高延性化のメカニズム

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  • Mechanism of Improved Ductility of 1,500 MPa-class Ultra-high Strength Cold-rolled Steel Sheet Produced by Rolling and Partitioning Method
  • Rolling and Partitioningホウ デ セイゾウ サレル 1,500MPaキュウ チョウコウキョウド ウスコウハン ノ コウエンセイカ ノ メカニズム

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<p>By using a steel with standardized chemical composition and conventional manufacturing processes for flat-rolled steel strip, a 1,500 MPa class stainless steel sheet whose product of yield strength (YS) and total elongation (El) exceeds 30,000 MPa% was developed and its mass production has been established.Besides the excellent YS-El balance, the developed steel sheet has excellent performance for not only an anti-secondary work embrittlement but also high cycle fatigue endurance.</p><p>Core technology of the developed method is composed of a combination of high precision cold-rolling and isothermal partitioning treatment in a batch furnace, the name of which was called Rolling and Partitioning (R&P) method. By the R&P method, the microstructure of steel is controlled to the mixture of a strain induced martensite as the matrix phase, and an optimum amount of retained austenite as the second phase which is dispersed in isolation and surrounded by the transformed martensite.</p><p>In this paper, the microstructure formation during the R&P process and the deformation mechanism that would bring about the excellent strength-ductility balance are discussed based on the results obtained from the in-situ neutron diffraction measurement. The results have revealed that the typical Lüders-like stress-strain curve of R&P steel is caused by competitive plastic flow between austenite and martensite, and an effective transformation induced plasticity phenomenon.</p>

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  • 鉄と鋼

    鉄と鋼 106 (3), 154-164, 2020

    一般社団法人 日本鉄鋼協会

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