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耐磨复合衬板的形貌影响因素

所属分类:公司动态 发布时间:2021-04-17 15:25:02 来源:http://www.lcnmb500.com 浏览量:

耐磨复合衬板的残余奥氏体分布在马氏体和相交区的板条之间,大多呈片状,厚度约为50-200纳米。随着分配时间的增加,残余奥氏体膜的宽度减小。

The retained austenite of the wear-resistant composite lining plate is distributed between martensite and lath in the intersection zone, most of which are flakes, and the thickness is about 50-200 nm. With the increase of distribution time, the width of retained austenite film decreases.

由于耐磨复合衬板中残余奥氏体的形状受马氏体相变和形貌的影响,等温过程中马氏体相变继续发生,马氏体板条厚度继续增加。着重研究了复合衬板热处理中不同工艺参数对耐磨复合衬板组织的影响。

Because the shape of retained austenite in wear-resistant composite liner is affected by martensitic transformation and morphology, martensitic transformation continues to occur during isothermal process, and the thickness of martensitic lath continues to increase. The effect of different process parameters on the microstructure of wear-resistant composite liner was studied.

耐磨复合衬板的形貌影响因素(图1)

用光学显微镜、扫描电子显微镜、电子背散射衍射、X射线衍射和透射电子显微镜对其微观结构进行了表征。研究了基体组织的变化以及残余奥氏体的形态、分布和含量与工艺参数的对应关系。设计了一种强塑性产品超过20,000兆帕%的处理工艺。

The microstructure was characterized by optical microscope, scanning electron microscope, electron backscatter diffraction, X-ray diffraction and transmission electron microscope. The change of matrix structure and the relationship between the morphology, distribution and content of retained austenite and process parameters were studied. A treatment process of over 20000 MPa% for strong plastic products was designed.

主要工作和研究结果如下:在相同的分区温度下,随着分区时间的延长,马氏体地区的板条逐渐变粗,板条的特性逐渐不明显,板条之间的界面不是明锐的,变成弯曲的。这是由QP处理过程中马氏体/奥氏体相界面的迁移和马氏体基体的回火转变引起的。

The main work and research results are as follows: at the same partition temperature, with the extension of partition time, the laths in martensite region become thicker, the characteristics of laths become less obvious, and the interface between laths is not sharp, but curved. This is caused by the migration of martensite / austenite interface and the tempering transformation of martensite matrix during QP treatment.

随着保温时间的增加,耐磨复合衬板板条间碳化物颗粒数量明显增加,两步QP处理的分配温度提高到450。耐磨复合衬板马氏体板条中的碳化物颗粒仍然存在,但数量明显减少。可以推断,碳化物颗粒在较低的分配温度下大多为过渡碳化物,在450时相对受到抑制。

With the increase of holding time, the number of carbide particles between the strips of the wear-resistant composite liner increased significantly, and the distribution temperature of the two-step QP treatment increased to 450. The carbide particles still exist in the martensite lath of the wear-resistant composite liner, but the amount is obviously reduced. It can be inferred that most of the carbide particles are transition carbides at lower distribution temperature, and are relatively restrained at 450.

在相同的温度和时间下,两步QP热处理获得的残余奥氏体体积分数高于一步QP热处理。合理优化400耐磨复合衬板处理工艺参数,可有效提高分配效率,增加残余奥氏体体积分数。

At the same temperature and time, the volume fraction of retained austenite obtained by two-step QP heat treatment is higher than that by one-step QP heat treatment. The distribution efficiency and volume fraction of retained austenite can be effectively improved by optimizing the processing parameters of 400 wear resistant composite liner.