妖圖惑眾---QT Q/T

leomet

Q/T : quenched / tempered

感應硬化區下的過渡區

For your eyes only.

[ 本帖最后由 leomet 于 2009-4-26 08:06 编辑 ]

wangqinghua196

欢迎到大陆来观光、旅游！

钢铁医生

常来看看，常来看看。实践与理论结合。更加利于学习加深印象。

样品制作
金相照片
做的非常好
学习了



钢铁医生--淬火冷却技术

所以因为

手法和设备都非常OK。
漂亮！

盛丽丽

金相照片很漂亮，请问老师图中白色组织是何组织？

qinqiang268

请吴老师讲解一下该球铁感应淬火后过渡区形成的组织相组成。
增长我们大家的见识！

sangshulee

彩色金相，真的很漂亮，以前做过金相，但都是黑白的，不是很好看
做的不错，

leomet

Carbide particles, ain't they?

leomet

On heating,
pearlite → austenite ; ferrite enveloping graphite nodules → austenite, carbon diffuses into it.  
On quenching,
these austenite colonies → martensite.  That's it, and that's all.

[ 本帖最后由 leomet 于 2009-5-1 14:29 编辑 ]

leomet

Poor tinting results.
For me, a successful tinting does not come by easily.
It's lot of trial-and-errors.

[ 本帖最后由 leomet 于 2009-4-28 10:44 编辑 ]

leomet

You do not notice these carbide particles when ferrite is white in color.
When you tint ferrite brown yellow or darker colors, they stand out.
Can you guys see the carbide particles in this photo?

[ 本帖最后由 leomet 于 2009-5-1 14:36 编辑 ]

qinqiang268

请吴老师用中文回复。

盛丽丽

吴老师你好，铁素体，碳化物从形态上应该是有区别的，我们生产的QT700-2组织中也纯在两种组织，碳化物要求小于1.5%，如有争论时，采用20%过硫酸氨腐蚀就很清楚鉴别出来，但这种分散的碳化物还是有点怀疑。能否证明一下？谢谢！

82783671

不错请吴老师用中文回复

leomet

To all young unknown faces:
不費一點力氣就想學到東西?  
我英打較快,  要從我的相片學到東西. 要勤查字典, please!  我也是這樣學來的.

To 13#
1. Particles in the matrix of ferrite:  I can not think of any phase else but carbide. Do they looks like stains? Some may, but not all of them. Please note that this  is not  an as-cast specimen,  as you may always see at your work. It is an induction hardened specimen. They are nothing more than proeutectoid cementite  precipitated prior to the formation of martensite  on continous cooling.

[ 本帖最后由 leomet 于 2009-5-2 16:30 编辑 ]

盛丽丽

谢谢吴老师教诲，白色除了是碳化物我也想不出是何组织，吴老师能否将试样采用20%过硫酸氨深腐蚀一下，发张照片，多谢！

紫琅人

哦好漂亮的金相图,见识哦,要是老师能把图片英文翻译和组织形成工艺情况讲解,那更好了,非常感谢

leomet

Sorry, I do not have this etchant of 20%过硫酸氨.

As a matter of fact, this is the very first time I see these carbide particles too. Without color tinting, I would never  notice its existence as most of you do.

It seems to me that you are working in an iron foundry. I make my living in this industry too. You can see my blog in Taiwan Yahoo, searching with LeoMet. There is a lot of info you might find useful. But do not ask questions, because I do not answer questions openly.

[ 本帖最后由 leomet 于 2009-5-2 18:23 编辑 ]

盛丽丽

谢谢老师，明白你的意思