Synergistic roles of M2C precipitates and reversed austenite in the strengthening and toughening of a CoNi secondary hardening steel

2026-08-03

PRE

Shangkun Wang

Xinyan Zhao

Tan Zhao

Xiao-Han Wan

Yaohui Jin

Liujie Xu

邓

邓想涛 (Xiangtao Deng) *

Zhaodong Wang

DOI：10.1016/j.matchar.2026.116878

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• 500 °C tempering gave peak M2C strengthening. • Reverted austenite governed toughness evolution. • Film-like austenite raised stable crack propagation energy. • Optimal strength-toughness balance occurred at 570 °C.

Keywords:

Secondary hardening steel

M2C precipitates

Reversed austenite

Strengthening-toughening mechanism

Stable crack propagation

Synergistic roles of M2C precipitates and reversed austenite in the strengthening and toughening of a CoNi secondary hardening steel

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