Scholarlink

<p>The heterostructured medium Mn steels are fabricated via tailoring the schedule of cold rolling reduction and subsequent intercritical annealing in the present study. The strengthening mechanism of hetero-deformation induced (HDI) hardening in the heterostructured steels is revealed, and the interplay between cold rolling reduction and formation of morphological heterostructure and its effect on the mechanical properties are clarified. The heterostructure concurrently compromising the granular and lath-typed microstructures is obtained in the intercritically annealed medium Mn steels with the cold rolling reduction of 40% and 60%. The formation of heterostructure should be attributed to the occurrence of partial recrystallization in the sites with strain concentration within the as-cold-rolled samples. The heterostructured steels exhibit enhanced mechanical properties in comparison to their homogeneous counterpart, which should be originated from the joint effect of the HDI hardening and enhanced transformation-induced plasticity (TRIP) effect. The mutual constraint between the lath-typed and granular microstructures facilitates the accumulation of GNDs in the soft domain, producing significant HDI hardening. The volume fraction of lath-typed microstructure is closely dependent on the cold rolling reduction and further plays an important role in the mechanical properties. An ideal heterostructure can be obtained in the steel through cold rolling reduction of 60% + intercritical annealing at 665&#xa0;°C for 1&#xa0;h. During deformation, the soft domains (lath-typed microstructure) can be rigidly constrained by the hard domains (ultrafine-grained granular matrix), promoting the multiplication of GNDs and thus leading to the significant HDI hardening and the enhanced TRIP effect. It is of great significance that the heterostructure can be introduced in the medium Mn steel to achieve enhanced mechanical properties by adopting the appropriate processing schedule of cold rolling and intercritical annealing.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Achieving an enhanced strength-ductility synergy in a medium Mn steel: on the interplay between cold rolling reduction and morphological heterostructure

  • 期刊论文

  • 发表日期：

    2025年10月13日

查看全文
  • Yu Zhang,
  • Xinyu Meng,
  • Sitian Tang,
  • Hua Ding

摘要

The heterostructured medium Mn steels are fabricated via tailoring the schedule of cold rolling reduction and subsequent intercritical annealing in the present study. The strengthening mechanism of hetero-deformation induced (HDI) hardening in the heterostructured steels is revealed, and the interplay between cold rolling reduction and formation of morphological heterostructure and its effect on the mechanical properties are clarified. The heterostructure concurrently compromising the granular and lath-typed microstructures is obtained in the intercritically annealed medium Mn steels with the cold rolling reduction of 40% and 60%. The formation of heterostructure should be attributed to the occurrence of partial recrystallization in the sites with strain concentration within the as-cold-rolled samples. The heterostructured steels exhibit enhanced mechanical properties in comparison to their homogeneous counterpart, which should be originated from the joint effect of the HDI hardening and enhanced transformation-induced plasticity (TRIP) effect. The mutual constraint between the lath-typed and granular microstructures facilitates the accumulation of GNDs in the soft domain, producing significant HDI hardening. The volume fraction of lath-typed microstructure is closely dependent on the cold rolling reduction and further plays an important role in the mechanical properties. An ideal heterostructure can be obtained in the steel through cold rolling reduction of 60% + intercritical annealing at 665 °C for 1 h. During deformation, the soft domains (lath-typed microstructure) can be rigidly constrained by the hard domains (ultrafine-grained granular matrix), promoting the multiplication of GNDs and thus leading to the significant HDI hardening and the enhanced TRIP effect. It is of great significance that the heterostructure can be introduced in the medium Mn steel to achieve enhanced mechanical properties by adopting the appropriate processing schedule of cold rolling and intercritical annealing.