高延性ダイクエンチによる高強度成形品及びその製造方法

摘要

A high-strength die-quenched part 1 is formed by heating a high-strength steel sheet 11 up to an austenite region, hot stamping and cooling inside a mold, and its microstructure has the martensite wherein carbide particles 2 are finely dispersed over an entire region including prior-austenite grain boundaries. It is desirable that the prior-austenite grain size in the microstructure of the high-strength steel sheet, which is a base material, be 10 µm or smaller. The high-strength die-quenched part has high-strength and high-ductility thanks to its martensite.