欢迎来到聊城福瑞营物资有限公司网站!
公司简介 联系我们
微信扫一扫
微信扫一扫
服务热线:

服务热线:

13165401858

您现在所在的位置: 首页 > 新闻动态 > 行业资讯

HARDOX500耐磨板耐磨板粒状珠光体的形成对产品起到了什么作用

所属分类:行业资讯 发布时间:2021-02-02 11:50:04 来源:http://www.lcnmb500.com 浏览量:

HARDOX500耐磨板工厂指出,在片状珠光体形成过程中,片层相间的许多渗碳体与铁素体并非均需通过各自重新 生核形成,研究表明,当铁素体在相渗碳体片两侧产生之后,渗碳体或铁素体的继续交替形成,则可能分别在各自的层片边缘以“搭桥”方式增殖,而勿需重新 生核。珠光体组织中所呈现的渗碳体分枝连接形态,即可证实上述搭桥生长机制。

HARDOX500wear-resistant plate factory pointed out that during the formation of lamellar pearlite, many cementite and ferrite between lamellar phases do not need to be reconstituted by themselves The results show that when the ferrite is formed on both sides of the cementite sheet, the cementite or ferrite will continue to form alternately, and then they may proliferate in the way of "bridging" at the edge of the respective lamellae respectively without re nucleation. The morphology of cementite branching and connecting in pearlite can confirm the above bridging growth mechanism.

HARDOX500耐磨的片状珠光体是均匀化奥氏体在缓冷条件下形成的,经光学显微镜即可明显观察到渗碳体与铁素体的片层状混合组织,其片间距约为15O一450nm。当过冷度增加时,由于形核率与成长速度的增加,其转变产物的金属形貌也发生变化。随着转变温度的降低,所形成的渗碳体与铁素体片显著变薄,即相应为索氏体和屈氏体。

The lamellar pearlite of HARDOX500wear-resistant plate is formed by homogenizing austenite under slow cooling condition. The lamellar mixed structure of cementite and ferrite can be clearly observed by optical microscope, and the lamellar spacing is about 15o-450nm. With the increase of undercooling, the morphology of the transition products also changes with the increase of nucleation rate and growth rate. With the decrease of transformation temperature, the cementite and ferrite flakes become thinner, that is, sorbite and troostite.

HARDOX500耐磨板耐磨板粒状珠光体的形成对产品起到了什么作用(图1)

耐磨板的粒状珠光体系指分布在铁素体基本上的渗碳体为球状的两相混合组织。这里主要结合耐磨板普通球化退火过程简述粒状珠光体的形成。

The granular pearlite system of wear-resistant plate refers to the two-phase mixed structure of cementite which is basically distributed in ferrite. In this paper, the formation of granular pearlite is briefly described in combination with the ordinary spheroidizing annealing process of wear-resistant plate.

Hardox500耐磨板工厂研究表明,在奥氏体转变为珠光体的过程中,奥氏体化温度对渗碳体的形态具有重要作用。当加热温度时,由于奥氏体成分的不均匀性将有助于缓冷时共析渗碳体的球化;相反,随着加热温度增 高,奥氏体均匀化程度增加,则冷 却时形成片状珠光体的倾向增加。

The research in hardox500 wear resistant plate factory shows that the austenitizing temperature plays an important role in the transformation of austenite to pearlite. On the contrary, with the increase of heating temperature, the degree of austenite homogenization increases, and the tendency to form flake pearlite increases.

对于耐磨板上加热奥氏体化时,由于大量未溶碳化物质点的存在,则冷 却时其周围的碳原子通过扩散将以这些碳化物质点为核心不断发生析聚与球化。与此同时,所造成的基本贫碳区将有助于铁素体的形核与长大。因此,在形成粒状珠光体的过程中,未溶二次碳化物的存在实际上起到了球化核心的作用。

When austenitizing on the wear-resistant plate, due to the existence of a large number of undissolved carbonized material points, the carbon atoms around them will continue to segregate and spheroidize with these carbonized material points as the core by diffusion during cooling. At the same time, the basic carbon poor zone will contribute to the nucleation and growth of ferrite. Therefore, in the process of forming granular pearlite, the existence of undissolved secondary carbide actually plays the role of spheroidizing core.

耐磨板工厂试验表明,当原始组织分散度较大时,为保持奥氏体成分的不均匀性,以利于粒状珠光体的形成,应适当降低加热温度。此外,加热速度与加热后的保温时间也有一定影响。例如,在常规情况下,耐磨板球化退火温度一般为790一810℃,而当快速加热保温305时,则加热温度可提高至850℃ 。

The factory test of wear-resistant plate shows that the heating temperature should be reduced appropriately in order to keep the inhomogeneity of austenite composition and facilitate the formation of granular pearlite when the original structure dispersion is large. In addition, heating speed and holding time after heating also have a certain influence. For example, under normal conditions, the spheroidizing annealing temperature of wear-resistant plate is generally 790-810 ℃, while when the rapid heating temperature is 305 ℃, the heating temperature can be increased to 850 ℃.

HARDOX500耐磨板的粒状珠光体分散度通常可直接以碳化物颗粒的平均直径(或平均间距)与单位面积中碳化物颗粒的平均数量表示,生产中一般多以退火硬度来间接反映。

The dispersion of granular pearlite in HARDOX500耐磨板wear-resistant plate can be directly expressed by the average diameter (or average spacing) of carbide particles and the average number of carbide particles per unit area, which is usually indirectly reflected by the annealing hardness in production.

粒状珠光体的分散度主要取决于加热温度与未溶碳化物的大小及其数量,而等温退火时,以下的等温温度以及连续退火时的冷 却速度也有一定影响。耐磨板的等温退火时等温转变温度与碳化物平均直径分别同退火硬度之间的关系。

The dispersity of granular pearlite mainly depends on the heating temperature, the size and quantity of undissolved carbides, and the following isothermal temperature and the cooling rate of continuous annealing also have a certain influence on isothermal annealing. The relationship between the isothermal transformation temperature and the average diameter of carbides and the annealing hardness of wear-resistant plate during isothermal annealing is studied.