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高铬耐磨钢板冷轧后尺寸测量方法

所属分类:行业动态 发布时间:2021-05-21 来源:https://www.lcnaimoban.com/ 浏览量:

采用扫描电子显微镜、X射线能谱仪观察了高铬耐磨钢板中MnS粒子在热变形及不同温度保温后的析出形核行为和形貌特征,分析高铬耐磨钢板经60%冷轧后在600~1000℃范围再结晶退火过程中微观组织和取向演变,第二相粒子的分布状态、粒子面密度、平均尺寸以及相应的尺寸分布。
The precipitation and nucleation behavior and morphology of MNS particles in high chromium wear-resistant steel sheet after hot deformation and heat preservation at different temperatures were observed by scanning electron microscope and energy dispersive X-ray spectrometer. The evolution of microstructure and orientation, the distribution state of second phase particles, the area density of particles, and the morphology of MNS particles in high chromium wear-resistant steel sheet during recrystallization annealing at 600-1000 ℃ after 60% cold rolling were analyzed Average size and corresponding size distribution.
高铬耐磨钢板在大压下量冷轧,随压下量的增加,退火晶粒向γ线聚集,强烈的初始组织及织构的差异随轧制及退火次数的增多逐渐消失,形成强{111}<112>织构。制加工造成了大量第二相粒子弥散、细小地析出,同时基体仍保持过饱和状态,提高冷轧压下率,退火织构{111}<100>,{110}<001>强度减弱,增加退火时间,退火织构{111}<110>,{100}<001>,{110}<001>强度变弱。
NM400耐磨板
When high chromium wear-resistant steel plate is cold-rolled with large reduction, the annealed grains tend to decrease with the increase of reduction γ With the increase of rolling and annealing times, the strong {111} < 112 > texture is formed. The results show that a large number of second phase particles disperse and precipitate finely, while the matrix remains supersaturated. With the increase of cold rolling reduction, the annealing texture {111} < 100 >, {110} < 001 > strength decreases, and with the increase of annealing time, the annealing texture {111} < 110 >, {100} < 001 >, {110} < 001 > strength decreases.
无论柱状晶按何种方向排列,只要表面存在剪切力,热轧后高铬耐磨钢板都可形成剪切织构,同时中心形成轧制织构,以先析出的MnS为形核核心,形成粗大微米级的复合析出相。
No matter which direction the columnar grains are arranged, as long as there is shear force on the surface, the shear texture can be formed in the hot rolled high chromium wear-resistant steel plate, and at the same time, the rolling texture can be formed in the center, with the first precipitated MNS as the nucleation core, forming coarse and micro composite precipitates.
900~1000℃范围内各实验钢铁素体的化学成分相似,因而其再结晶激活能基本一致,形成较强的{111}〈112〉织构,弥补了初始高铬耐磨钢板中Goss织构过弱的不足,主要包括旋转立方织构和{112}<1-10>。冷轧变形会造成第二相粒子的回溶行为,而高铬耐磨钢板基体的过饱和状态会减弱回溶现象,先共析铁素体因形变同样产生强烈的织构,柱状晶造成的影响主要体现在高铬耐磨钢板中心层,长轴平行于轧向排列的样品热轧时形成的粗大旋转立方晶粒要到脱碳退火后才能完全消除。
The results show that the chemical composition of ferrite is similar in the range of 900-1000 ℃, so the activation energy of recrystallization is basically the same, forming a strong {111} 〈 112 〉 texture, which makes up for the weakness of Goss texture in the initial high chromium wear-resistant steel plate, mainly including the rotating cube texture and {112} < 1-10 > texture. Cold rolling deformation will result in the re solution behavior of the second phase particles, while the supersaturation state of the high chromium wear-resistant steel plate matrix will weaken the re solution phenomenon. Proeutectoid ferrite also produces strong texture due to deformation. The effect of columnar crystal is mainly reflected in the central layer of the high chromium wear-resistant steel plate, For the samples with long axis parallel to the rolling direction, the coarse rotating cubic grains formed during hot rolling can not be completely eliminated until decarburization annealing.
高铬耐磨钢板退火过程中会同时存在新粒子的形核及已析出粒子的粗化两个过程,在复合析出相表面形成也可以在基体中单独出现,还会有从奥氏体转变而来的粗大珠光体或渗碳体,导致再结晶,使晶粒细化,高铬耐磨钢板的组织均匀,织构过强。
During the annealing process of high chromium wear-resistant steel plate, there are two processes: nucleation of new particles and coarsening of precipitated particles. The formation of composite precipitates on the surface can also appear in the matrix alone. There will also be coarse pearlite or cementite transformed from austenite, leading to recrystallization and grain refinement. The structure of high chromium wear-resistant steel plate is uniform and the texture is too strong.
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