热模拟平面应变条件下的热轧织构研究

以微合金钢为材料,采用光学显微镜和EBSD,研究热模拟平面应变实验条件下再结晶奥氏体和变形奥氏体的织构演变.研究发现,在热模拟平面应变实验的压缩过程中,试样的两个自由端限制了变形区金属的宽向流动,达到了很好的平面应变状态.对于再结晶奥氏体相变工艺,由于相变前奥氏体发生再结晶,无畸变保留,奥氏体分解为仿晶界铁素体、贝氏体和少量的珠光体,织构为{100}〈011〉α;对于变形奥氏体相变工艺,未再结晶区的变形促进了铁素体相变,使奥氏体分解为铁素体和珠光体组织,织构为{332}〈113〉α和{113}〈110〉α.此两种工艺条件下的织构,皆为平面应变条件下的奥氏体相变织构,即热模拟平面应变实验可以达到...

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Published in东北大学学报（自然科学版） Vol. 37; no. 8; pp. 1104 - 1107
Main Author 沈鑫珺 唐帅 杨小龙 王国栋
Format Journal Article
LanguageChinese
Published 东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳,110819 2016
Subjects
EBSD
平面应变
热模拟平面应变实验
热轧织构
平面应变
hot rolling texture
thermo-mechanical simulation plane strain compression test
热轧织构
plane strain
热模拟平面应变实验
EBSD
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Summary:以微合金钢为材料,采用光学显微镜和EBSD,研究热模拟平面应变实验条件下再结晶奥氏体和变形奥氏体的织构演变.研究发现,在热模拟平面应变实验的压缩过程中,试样的两个自由端限制了变形区金属的宽向流动,达到了很好的平面应变状态.对于再结晶奥氏体相变工艺,由于相变前奥氏体发生再结晶,无畸变保留,奥氏体分解为仿晶界铁素体、贝氏体和少量的珠光体,织构为{100}〈011〉α;对于变形奥氏体相变工艺,未再结晶区的变形促进了铁素体相变,使奥氏体分解为铁素体和珠光体组织,织构为{332}〈113〉α和{113}〈110〉α.此两种工艺条件下的织构,皆为平面应变条件下的奥氏体相变织构,即热模拟平面应变实验可以达到很好的平面应变状态,可用于研究热轧过程的织构演变.
Bibliography:21-1344/T
hot rolling texture; thermo-mechanical simulation plane strain compression test; plane strain; EBSD
The texture evolution of recrystallized austenite and deformed austenite in the plane strain compression test was investigated using optical microscope and electron backscattered diffraction（EBSD） by thermo-mechanical simulator.The results showthat the plane strain state can be obtained because the two free-ends of the sample limit the transverse metal flowin the deforming zone.For the process of transformation texture of recrystallized austenite,the austenite transforms to allotriomorphic ferrite,bainite and a little pearlite,because recrystallization of austenite occurs and there is not obvious lattice distortion before transformation,and the transformation texture is { 100 } 011 α.For the process of transformation texture of deformed austenite,the austenite transforms to ferrite and pearlite due to the deformation in nonrecrystallized austenite region,and the transformation textures are { 332 } 113 α
ISSN:1005-3026
DOI:10.3969/j.issn.1005-3026.2016.08.009