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首页> 外文期刊>ISIJ international >Heterogeneous Nano-structure and its Evolution in Heavily Cold-rolled SUS316LN Stainless Steels
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Heterogeneous Nano-structure and its Evolution in Heavily Cold-rolled SUS316LN Stainless Steels

机译：SUS316LN冷轧不锈钢的异质纳米结构及其演变

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摘要

Evolution of heterogeneous nano-structure in heavily cold-rolled SUS316LN stainless steels was investigated in detail. Transmission electron microscopic observations from the transverse direction (TD) of the 92% rolled specimen revealed the formation of a typical hetero-nano structure composed of ultra-fine lamellar grains embedded with deformation twin domains. The twin domains had prolate ellipsoidal shape elongated parallel to TD. Two types of twin domains with different crystallographical orientations to matrices could be identified, i.e., i) <211> //rolling direction (RD) and <110> //TD or ii) <110> //RD and <211 > //TD, although all the {111} twining planes of both twin domains were oriented nearly parallel to the rolling planes. The ultra-fine lamellar grains were elongated along < 100 > direction and nearly parallel to RD. Deformation twins with a few nano-meter spacing were also frequently observed to develop in the lamellar grains. Evolution sequence of the hetero-nano structure during cold rolling was also investigated. At an early stage of rolling, deformation twins were gradually formed in the whole grains. Then, the regions fragmented grains by twins were further subdivided by a numerous number of shear bands inclined at about 20-45° from the RD, resulting in the formation of "eye-shaped" twin domains surrounded by shear bands and their crystallographical rotation. Cold rolling up to 50% caused a considerable increase in strength and decrease in ductility. While the strength was raised more with increasing reduction up to 92%, both the strength and ductility eventually slightly decreased by further rolling.
机译：详细研究了冷轧SUS316LN不锈钢中异质纳米结构的演变。从92％轧制试样的横向（TD）进行的透射电子显微镜观察表明，形成了典型的异质纳米结构，该结构由嵌入变形双畴的超细层状晶粒组成。孪晶畴具有长椭圆形的椭圆形形状，平行于TD。可以确定两种类型的孪晶畴，它们与基质的晶体学取向不同，即，i）<211> //滚动方向（RD）和<110> // TD或ii）<110> // RD和<211> / / TD，尽管两个孪晶域的所有{111}孪晶面都几乎平行于滚动面定向。超细层状晶粒沿<100>方向伸长，几乎与RD平行。还经常观察到具有几纳米间距的变形孪晶在层状晶粒中发展。还研究了冷轧过程中异质纳米结构的演化顺序。在轧制的早期阶段，变形孪晶逐渐在整个晶粒中形成。然后，由孪晶破碎的晶粒的区域进一步被从RD倾斜约20-45°的许多剪切带进一步细分，从而形成了被剪切带包围的“眼形”孪晶畴，并且它们的晶体学旋转。高达50％的冷轧导致强度显着提高，延展性降低。随着强度的增加（增加到92％），强度和延展性最终都因进一步轧制而略有下降。

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