摘要
利用Ｘ射线衍射和背散射电子衍射（ＢＳＥＤ）分析了单向热压缩条件下碳素钢Ｑ２３５应变强化相变产生的铁素体及 先共析铁素体在应力作用下的晶粒取向分布特点，结果表明，通过应变强化相变产生的铁素体晶粒取向并非完全随机分布，而有较 强的（１１１）／／ ＮＤ线织构 这明显不同于形变铁素体和部分动态再结晶的铁素体晶粒取向待征，先共析铁素体的相对量与（１００） ／／ＮＤ线织构的强度对应。ＢＳＥＤ局部取向（差）定量分析表明，（１１１）取向既可来自应变强化相变，也可来自形变的先共析 铁素体。虽然先井析铁素体形变后外形为形变长条状，但内部仍存在一定的大角晶界；表明先共析铁素体在大应变下进行了一定程
X-ray diffraction and BSED (back scattering electron diffraction) techniques were applied to reveal the orientation information of ferrite grains in samples from a plain low carbon steel Q235 under thermally compressed condition. Results show that the grains of dynamically transformed ferrite are not randomly oriented, but exhibit a strong (111) fiber texture as well as other weak fiber textures which were distinguished from the typical uni-axial compressed bcc textures. Dynamic recrystallization of ferrite occurs at heavy strain and weakens the deformation texture of ferrite grains. Under heavy strain the pre-eutectoid ferrite undergoes dynamic recrystallization to some extent and the intensity of (100) fiber texture is proportional to the amount of pre-eutectoid ferrite. Local orientation analysis reveals that the (111) fiber texture may either be aroused by deformed ferrite or by the strain induced ferrite nucleated in deformed austenite.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第9期900-906,共7页
Acta Metallurgica Sinica
基金
国家重点基础研究课题资助项目 1998061506
关键词
碳素钢
应变强化相变
织构
晶粒细化
动态再结晶
plain carbon steel
strain enhanced transformation
texture
dynamic recrystallization
