经典的金相组织照片(会员"leomet"的合集)

leomet · 发表于 2010-1-9 12:48:44

本帖最后由 leomet 于 2010-6-12 05:58 编辑

4140 as_rolled condition. There are always carbide films hidden in
this kind of microstructure, but they are very difficult to be seen. In induction hardening, parts with this microstructure are prone to quench crack .

leomet · 发表于 2010-1-18 06:15:14

本帖最后由 leomet 于 2010-2-18 09:53 编辑

DRM 3, HSS with fewer primary carbide, aimming to enhance its toughness.
Annealed. The last 2 photos are tinted: Carbide : dirt-yellow; Ferrite: white.

z051443019 · 发表于 2010-1-19 12:43:25

吴老师您好！
非常感谢您将多年的积累上传，供我们后辈学习。您的金相图片非常的棒，不仅内容丰富，图片也非常的好看，一路看下来，受益匪浅。不仅仅这些金相图片，专业知识，您的这种精神，也是值得我们这些晚辈学习的。

leomet · 发表于 2010-1-20 05:03:54

本帖最后由 leomet 于 2010-4-14 20:49 编辑

回复 211# z051443019

They say " flattery will get you anywhere".

I am glad that you guys learned something from my posts
which are just aimming to showing-off my beautiful photos.

leomet · 发表于 2010-1-20 05:07:24

本帖最后由 leomet 于 2010-1-20 05:13 编辑

DRM 3 quenched and tempered, cross section

dhzhou888 · 发表于 2010-1-20 05:15:03

吴老师真早啊，5：00就在发帖了。我刚吃过中饭。

leomet · 发表于 2010-1-21 09:50:50

回复 214# dhzhou888

四奌醒來睡不著, 所以....

鬼谷子 · 发表于 2010-1-21 16:19:19

perfect！原来金相图片也可以做成这样。上学的时候，老师讲金相就是课本上的那几幅图，感觉金相实验课比较枯燥，也分不清各种组织。今天确实很有收获，很佩服的是吴老师的专业精神。另外吴老师能不能传几张碳氮共渗的金相图片，先谢谢了

neolj · 发表于 2010-1-21 23:59:21

吴老师您好，我们有一种Co50材质的轴套，不知用什么形式的热处理才好？谢谢！

leomet · 发表于 2010-1-22 07:01:40

回复 218# neolj
Sorry, I am not Mr. Know-it-all.

leomet · 发表于 2010-1-22 07:04:04

回复 217# 鬼谷子
Sorry, I do not have.

leomet · 发表于 2010-1-23 15:48:14

本帖最后由 leomet 于 2010-1-28 06:46 编辑

Shared with you are some FT photos that are too good to be kept to myself.
They are now for your visual delight and for your keeping.

w6z6d6@163.com · 发表于 2010-1-24 19:33:09

回复 162# leomet

吴老师，您好，您的照片非常经典，你能不能给我点钢调质后的照片及关于球墨铸铁白口组织的照片啊，w6z6d6@163.com,

leomet · 发表于 2010-1-25 07:00:31

本帖最后由 leomet 于 2010-2-18 09:57 编辑

The largest number of micrographs I have is of cast irons and tooling of H13.
The photos below were taken from the center of a runner of the dia. of 30 mm.
Inverse chill is the name for it, as most of you guys know.

leomet · 发表于 2010-1-31 09:25:05

本帖最后由 leomet 于 2010-2-18 09:58 编辑

Microstructure of a cylinder liner for ships.

leomet · 发表于 2010-2-18 09:47:09

本帖最后由 leomet 于 2010-2-18 14:51 编辑

Do you see what I see?
I hope this photo is entertaining
beside being delightful to your eyes.

leomet · 发表于 2010-2-21 11:29:56

來自一位德國65歲的退休metallurgist 的稱讚. 是同行, 是真正的專家. 網上認識的.

............ I am surprised at  the "damned" good* Micrographs! Color etching and/or DIC?
- and the highly instructive (educational) Articles.    I often see  good color- etched photos
on  a lot of  Metallographietagung",  but none was better than yours.
Unfortunately I cannot read the Chinese Types/Writing,  so I cannot learn as much as I could (written in English).

Evidently You are a Specialist in Cast Iron  (my old "Hobby").

leomet · 发表于 2010-3-13 19:03:47

本帖最后由 leomet 于 2011-5-4 06:06 编辑

JIS SCM440; AISI 4140 Spherodized for cold heading.
1.Bright field,
2 dark field,
3 carbide tinted blue,
4 Ferrite tinted brown.

leomet · 发表于 2010-3-13 20:36:26

本帖最后由 leomet 于 2010-7-31 06:58 编辑

H13 , SKD 61, 1.2344 Q/T along with P/M HSS.
I don't see this often and I bet you don't, either.

leomet · 发表于 2010-3-14 07:42:14

本帖最后由 leomet 于 2010-5-8 06:40 编辑

Useful photos for understanding dendritic segregation of irons  and steels
The last photo, direc_concentration.jpg, C濃度分佈圖, reposted from other website, is a computer simulation of a Fe-1%C alloy.
Note the carbon concentration distribution at the last stage of solidification. High solute atom concentration
at areas where dendrite arms meet (LFZ, last freeze zone) is the cause of "intergranular carbide" often found in many high
alloy steels, say H13, if  homogenization/diffusion annealing is not done sufficiently.
photo ~2716 and ~2711 are of the same QT700. ~2716 is in as-cast condition while ~2711 is an corresponding induction hardened area.
The LFZ in 2716, being carbide-rich, has turned into area with a lot of R.A. after induction hardening.
金屬樹枝晶凝固動態模擬影片:  Welding Institute of Aachen University in Germany 提供.
http://www.msm.cam.ac.uk/phase-t ... .models/movies.html

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