经典的金相组织照片(会员"leomet"的合集)

leomet · 发表于 2010-3-17 00:07:33

Mixed Grains 混晶

xiaoxianglou · 发表于 2010-3-17 20:45:45

回复 19# leomet

SKD是什么东西呀？锻后的组织是什么啊？铁素体和什么？呵呵，偶是新手

leomet · 发表于 2010-3-17 20:58:09

回复 223# xiaoxianglou

This is a place for "old hands", and no place for "new hands"

Sorry!

xiaoxianglou · 发表于 2010-3-17 21:34:04

回复 224# leomet

OH my ladygaga ! I just want to learn more about heat treatmens, not just some theories from books . Anyway ,thanks for you response

lwz_hl · 发表于 2010-3-30 15:55:16

Mr. Wu, I'm very shocked by your so many perfect microstructure pictures, this is my first time to visit this website, hence I can learn so much form these beautiful pictures. Thank you very much.
I'm a bearing engineer, I always want to have a look the microstructure pictures of bearing steel, such as the pictures of bearing steel forging, annealed forging, heat-treated bearing steel and related failed heat treatment pictures etc. I will appreciate you very much if you have these pictures to share with us,

Thanks

leomet · 发表于 2010-3-31 09:32:27

本帖最后由 leomet 于 2010-6-27 11:44 编辑

回复 228# lwz_hl
I do not get involved in bearing industry, therefore, cannot be of much help to you. Sorry about that.
Tooling industry and cast iron industry are what I have been working with since I quit teaching college-----about one 2 decades ago.

leomet · 发表于 2010-4-9 22:31:50

回复 232# fengfeng
Thanx !
You are one of the best too.

leomet · 发表于 2010-4-14 20:39:05

回复 234# sbfcbj

I did.

leomet · 发表于 2010-4-16 10:08:56

本帖最后由 leomet 于 2011-5-4 05:54 编辑

Show you something I have never done before.

SNCM 440 (?) specimen, polished, vacuum quenched from 1040 C, and observed the mirror surface after quenching. (not etched)
Shown below are Austenite grain boundaries and surface reliefs (浮凸) produced from phase transformation.

Note the subgrains in some larger grains. Subgrains should not be counted during determination of grain size.

leomet · 发表于 2010-4-16 10:14:46

本帖最后由 leomet 于 2011-5-4 05:57 编辑

Grains and subgrains of a unknown steel specimen.
Photos were taken decades ago. That is why I do not remember the name of the steel.
Note the subgrains inside real grains out-lined by proeutectoid product.

大虾 · 发表于 2010-4-16 10:28:32

吴老师：你能用中文解释一下具体的图片就好，真希望您以后在论坛上用中文的，我们都知您英文历害，毕竟多数人不会洋文呀，望理解。

leomet · 发表于 2010-4-16 22:17:28

本帖最后由 leomet 于 2011-5-4 06:00 编辑

回复 239# 大虾

This request has been raised a couple of times before. Reasons were explained before, too. "No pains, No gains".
I share my photos only with the selected few----those who are capable of reading English. So, please work hard
on your English. It will do you good, for the rest of your life.

A unknown steel specimen (probably SCM 440?), polished, vacuum quenched from 1040 C, and observed under OM.
Shown below are surface reliefs produced from phase transformation.
Interesting pattern.

leomet · 发表于 2010-4-17 10:10:16

本帖最后由 leomet 于 2010-5-3 22:16 编辑

An unknown steel specimen , (SNCM 440 ?) polished to mirror-surface and quenched in a vacuum furnace from 1040 C.
Shown below are photos of surface relief related to phase transformation.

leomet · 发表于 2010-4-17 10:45:25

本帖最后由 leomet 于 2010-6-12 05:37 编辑

This very specimen, (AISI 4340?), ground, polished and etched.

njxwl · 发表于 2010-4-20 15:33:30

perfect photo!
but it lack of heat treatment method ,it is a regret.

leomet · 发表于 2010-5-7 23:06:06

本帖最后由 leomet 于 2011-5-4 05:46 编辑

An unknown steel specimen , (SNCM 440 ?) larger in size than previous one (#241)
polished to mirror-surface and quenched in a vacuum furnace from 1040 C.
Shown below are photos with surface relief related to phase transformation.
Black spots are rusted shrinkage pores existed before mirror polishing.
Smooth areas are obtained from Ferritic/Pearlitic transformation and
rugged areas are related to Bainitic / Martensitic transformation.

Ronbin · 发表于 2010-6-4 14:38:21

回复 17# leomet

请问 friction material一般是什么材料

Ronbin · 发表于 2010-6-4 14:42:27

请问这张照片是普通的光学金相彩照吗，不像啊？
P4155308.jpg (73.87 KB)

leomet · 发表于 2010-6-4 16:59:51

本帖最后由 leomet 于 2010-7-31 06:47 编辑

回复 253# Ronbin

Photos in #242, #246 were taken from specimens right after quenching.
photos taken with OM. NOT SEM.

Ronbin · 发表于 2010-6-5 13:12:00

回复 254# leomet

请问 friction material一般是什么材料

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