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nm400耐磨钢板开裂的原因有哪些?

所属分类:常见问题 发布时间:2021-04-30 来源:https://www.lcnaimoban.com/ 浏览量:

(1)马氏体的显微裂纹
(1) Microcracks in martensite
一般认为,显微裂纹的产生是由于片状马氏体在高速长大时,相互撞击的结果;也可能是由于马氏体和奥氏体晶界或其他杂质相碰所造成。因为撞击时产生很高的应力,而片状马氏体比较脆,不能产生塑性变形使其应力松弛,因而便易产生显微裂纹。
It is generally believed that the formation of microcracks is due to the impact of lamellar martensite when it grows at high speed; It may also be caused by the collision between martensite and austenite grain boundaries or other impurities. Because of the high stress produced during impact, and the lamellar martensite is brittle, it can not produce plastic deformation to relax the stress, so it is easy to produce microcracks.
实验证明,影响马氏体显微裂纹敏感度的主要因素如下。
The experimental results show that the main factors affecting the susceptibility of martensitic microcracks are as follows.
①马氏体的形态。显微裂纹仅见于片状孪晶马氏体中,在条状位错马氏体中未曾发现。这可能是因为条状马氏体相互平行生长,撞击的机会少的缘故;即使撞击,由于它本身塑性较好,也不会产生显微裂纹。
NM450耐磨板
① The morphology of martensite. Microcracks are only found in the lamellar twin martensite, but not in the lath dislocation martensite. This may be due to the parallel growth of lath martensite and less chance of impact; Even the impact, because of its good plasticity, will not produce microcracks.
②钢的化学成分。化学成分主要是通过改变马氏体转变点( Ms)的位置来影响显微裂纹倾向的。一般来说Ms点越低,马氏体的孪晶倾向越大,越容易出现显微裂纹。马氏体中固溶碳量越高,Ms越低,马氏体的脆性越大,越容易形成显微裂纹。
② The chemical composition of steel. Chemical composition affects the tendency of microcrack mainly by changing the position of martensite transformation point (MS). Generally speaking, the lower the MS point is, the greater the twinning tendency of martensite is and the easier the microcracks appear. The higher the amount of solid solution carbon in martensite, the lower the MS, the greater the brittleness of martensite and the easier the formation of microcracks.
nm400耐磨钢板合金元素对显微裂纹的影响较小。
The alloy elements of nm400 wear-resistant steel plate have little effect on the microcrack.
③奥氏体的晶粒大小。试验发现,显微裂纹的形成敏感度随马氏体片长度增加而升高,马氏体片越长,撞击能量越高,显微裂纹密度越大。另一方面,较长的马氏体片遭受其他马氏体碰撞和冲击的机会也多,因此微裂纹也较多。  理论研究和试验发现,当马氏体长度增加时,马氏体片越长,撞击能量越高,撞击应力越大,显微裂纹的数目和长度增加。
③ The grain size of austenite. It is found that the sensitivity of microcrack formation increases with the increase of martensite sheet length. The longer the martensite sheet is, the higher the impact energy is, and the higher the microcrack density is. On the other hand, the longer martensite sheet has more chance of collision and impact from other martensites, so there are more microcracks. It is found that with the increase of martensite length, the longer the martensite plate is, the higher the impact energy is, the greater the impact stress is, and the number and length of microcracks increase.
(2)在实际生产中,钢制工件常由于结构设计不合理、钢材选择不当、淬火温度控制不正确、淬火冷速不合适等因素,一方面增大淬火内应力,使已形成的淬火显微裂纹扩展,形成淬火裂纹。另一方面,由于增大了显微裂纹的敏感度,增加了显微裂纹的数量,降低了钢材的脆断抗力,从而增大淬火裂纹的形成可能性。
(2) In the actual production, steel workpiece often due to unreasonable structure design, improper steel selection, incorrect quenching temperature control, improper quenching cooling rate and other factors, on the one hand, increase the internal stress of quenching, so that the formed quenching micro cracks expand and form quenching cracks. On the other hand, because the sensitivity of microcracks is increased, the number of microcracks is increased, and the brittle fracture resistance of steel is reduced, so the possibility of quenching cracks is increased.
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