2019年12月1日
Delayed cracking in hot stamping with hot trimming for ultra-high strength steel components
International Journal of Advanced Manufacturing Technology
- ,
- ,
- ,
- 巻
- 105
- 号
- 12
- 開始ページ
- 5081
- 終了ページ
- 5090
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s00170-019-04599-w
Hydrogen-induced delayed cracking in hot stamping with hot trimming for ultra-high strength steel components at various trimming temperatures was investigated. The trimming temperature of a heated quenchable sheet was adjusted by rapid cooling with the upper punch and die, and then, the sheet was trimmed and die-quenched. A cathode hydrogen charging test was performed to examine the occurrence of delayed cracking at trimmed edges, and then, tensile strength and total elongation of the hydrogen-charged specimen were measured from the tensile test. Below, a martensite transformation start temperature of 420 °C, the fracture surface and the tensile residual stress became large, and delayed cracking was caused on the fracture surfaces of the sheared edges. Although no delayed cracking of the hydrogen-charged specimen occurred above 420 °C, the tensile strength and total elongation were reduced by hydrogen embrittlement. The critical temperature of delayed cracking for a thin sheet having 1.0 mm in thickness rose to 600 °C.
- リンク情報
- ID情報
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- DOI : 10.1007/s00170-019-04599-w
- ISSN : 0268-3768
- eISSN : 1433-3015
- SCOPUS ID : 85075341252