加工硬化した高Mn鋼の磁性について

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書誌事項

タイトル別名
  • On the Magnetism in Work-hardened High Manganese Steel
  • カコウ コウカ シタ コウMn コウ ノ ジセイ ニ ツイテ

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抄録

In order to obtain the decisive reason for the magnetism of work-hardened Hadfield steel, various composition of practical manganese steels were examined by the magnetic colloidal method after cold working. In every cases, whenever austenitic manganese steel is work-hardened by impact at room temperature, by static tension at room temperature, or by impact at liquid nitrogen temperature, small amount of ferromagnetic product are formed at the traces of slip planes and at the grain boundaries. These ferromagnetic product are not formed at every slip planes and at every grain boundaries observed in etched surface, but formed at very partial portion.<BR>In unstable austenitic composition steels, both grain boundaries and slip planes are observed very clear line in magnetic colloid patterns, but as increasing carbon or manganese content in steels, these magnetism are gradually diminished slip planes first, and next grain boundaries. Ferromagnetic product are entirely not formed at grain boundaries in Fe-Mn alloys. The magnetism at grain boundaries can be decreased or diminished by annealing prior cold working, but the magnetism at the traces of slip planes can not be wholly affected.<BR>ε phase in manganese steels are considered the paramagnetic substance as same as γ phase, but has slightly stronger magnetism than γ phase at room temperature. Even ε phase coexists in γ phase considerably much ratio, magnetic colloid does not adhere at both phases. It is considered that ferromagnetic product at grain boundaries in work-hardened Hadfield steel are caused by the segregation of carbon at grain boundaries, which are accelerated by cold-working and grown up to the complex carbide. Otherwise, it is anticipated that small amount of very thin martensitic layer are present along the traces of slip planes.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 27 (10), 467-474, 1963

    公益社団法人 日本金属学会

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