Lacking of forest hardening makes low ductility in steels long challenge particularly at high yield strength. Here, we report to make good use of hetero-structuring for superior strength-ductility synergy in high manganese steel. The point is to retain original deformed structure of large quantity, along with recrystallized ultrafine-grains and fine grains, jointly for most effective heterogeneous deformation-induced (HDI) hardening especially at high strength. The residual plastic strain of larger than 0.2% and large proportion of HDI stress over 60% indicate the crucial role in ductility by HDI hardening. This renders a significantly upgraded strength-ductility combination within high strength scope.

缺乏森林硬化使得钢的低延展性长期面临挑战，特别是在高屈服强度下。在这里，我们报告了在高锰钢中充分利用异质结构获得优异的强度-延展性的协同作用。关键是要保留大量的原始变形结构，以及再结晶的超细晶粒和细晶粒，以便最有效地进行异质形变诱导（HDI）硬化，尤其是在高强度下。大于0.2％的残余塑性应变和超过60％的HDI应力的很大比例表明了HDI硬化对延展性的关键作用。这使得高强度范围内的强度-延展性组合得到了显着提升。