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珠光体的片间距越小,强度、硬度越高,但塑性越差。

发布日期:2020-12-11

珠光体的片间距越小,强度、硬度越高,但塑性越差。
A

B

试题解析

珠光体

珠光体是铁素体和渗碳体一起组成的机械混合物用符号“P”表示。碳素钢中珠光体组织的平均碳含量约为0.77% 。它的力学性能介于铁素体和渗碳体之间,即其强度、硬度比铁素体显著增高,塑性、韧性比铁素体要差,但比渗碳体要好得多。珠光体是由奥氏体发生共析转变同时析出的,铁素体与渗碳体片层相间的组织,是铁碳合金中最基本的五种组织之一。代号为P。是由发现者名字命名。(珠光体组织呈指纹状,其中白色的基底为铁素体)

中文名
珠光体
所属范围
材料科学基础,
存在位置
奥氏体
外文名
pearlite
表示字母
P
含碳量
ωc=0.77%

塑性

对物体施加外力,当外力较小时物体发生弹性形变,当外力超过某一数值,物体产生不可恢复的形变,这就叫塑性形变。塑性即物体变形的能力。与之相对的,对一物体施加外力,物体产生形变,移除外力,发现形变消失,物体恢复原样,这就是弹性,弹性越大的物体,能够承受越大的外力而不发生永久形变。而通常塑性越大的物体,能发生永久形变所需的最小力越小。

中文名
塑性
解释
外力
率相关性
大小可能是加载速度快慢的
外文名
Plasticity. Ductility,Briquettability
评价标准
伸长率
钢筋塑性指标
冷弯性能

硬度

硬度,物理学专业术语,材料局部抵抗硬物压入其表面的能力称为硬度。固体对外界物体入侵的局部抵抗能力,是比较各种材料软硬的指标。由于规定了不同的测试方法,所以有不同的硬度标准。各种硬度标准的力学含义不同,相互不能直接换算,但可通过试验加以对比。

中文名
硬度
类型
物理学专业术语
外文名
Hardness (stiffness)
解释
材料局部抵抗硬物压入其表面能力

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大学试题

理学

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