Microstructure of the collet chuck that is made of JIS SUJ 2, or AISI 52100.
Nothing is wrong with heat treatment.
本帖最后由 leomet 于 2012-11-27 21:27 编辑
Cr25 white iron + 15%Ni, 1020 Quenched, tempered at 200C
Matrix: Austenite with dispersion of carbide particles.
Proeutectic hex-rod carbide + eutectic mixture. 这么好的东西，我都不知道改用什么语言形容，对于我们这些初学者的教诲和启发是不能用任何东西衡量的！！！谢谢老师的奉献 thank you for showing us a lot of beautiful microstructure pictures, I learned a lot from them. 278481825 发表于 2012-11-27 21:11 static/image/common/back.gif
这么好的东西，我都不知道改用什么语言形容，对于我们这些初学者的教诲和启发是不能用任何东西衡量的！！！ ...
你認為這是奉獻.----我只是愛現.
不過我的愛現, 應該有些人愛看, 因為色彩豐富, 又多少可以學到一奌東西.
您好，可以帮我看看这个是什么组织吗。弹簧钢55CrSi直径12.8，感应加入，980淬火，460回火。抗拉强度是1806，断口收缩率是47，客户绕弹簧无法成型，一弯就断。谢谢各位帮忙分析。此图像为400倍。 这个是断口图片，断口有三个断裂源 leomet 发表于 2009-11-20 07:15 static/image/common/back.gif
My posts here are not meant for discussion. They are meant to be ” feasts to your eyes” only.Als ...
Thank you for giving us so valuble and best microstructure, these beautiful picture really "feasts to my eyes",you give me confidence to work on my job, now I work in heat treatment Lab, I have learned more from you,
these picture not only feasts to my eyes, but also feasts to my heart, let me have more confidence to study microstructure and know how to find the failure from the microstructure in HT, thank you Mr.Wu, you are a good teacher! 本帖最后由 leomet 于 2012-12-2 18:33 编辑
shijiansong 发表于 2012-12-2 14:38 static/image/common/back.gif
Thank you for giving us so valuble and best microstructure, these beautiful picture really "feasts ...
Good for you !
Your are one of those silent, but grateful elite engineers that benefit from my posts. I am glad that you spoke up.
妖圖惑眾
本帖最后由 leomet 于 2012-12-11 21:50 编辑Showing off colorful micrographs of ductile iron induction quenched.
They were taken from transition zone. Color area is Martensite. White area is Ferrite. Halo of Martensite around graphite nodules was Ferrite before hardening. On induction heating, this area transformed rapidly to Austenite. Carbon atoms diffused into the Austenite and it then transformed to Martensite on water-jet cooling.
I share with you because they are just too beautiful to keep to myself. leomet 发表于 2008-3-1 17:28 static/image/common/back.gif
右:color etching. 我读研究所时, 一位楊老师给的. 楊老师的也是1981留学英国剑桥大学时,他的老师给的.
...
专家好，我想问一下，如果出现贯穿试样的横裂纹有一些什么可能的情况，裂纹周围无脱碳 看看淬火后贝氏体组织，这个比较经典！ 來學習, 感謝分享。很漂亮的照片!我是在連聰賢老師的課堂上第一次見到這種藝術。 本帖最后由 leomet 于 2014-2-28 05:03 编辑
wic 发表于 2013-3-25 11:52 static/image/common/back.gif
來學習, 感謝分享。很漂亮的照片!我是在連聰賢老師的課堂上第一次見到這種藝術。
20年前 我辞去勤益科技大學機械系教職後,無業. 就弄了一套彩色金相掛圖販賣給有興趣的專校與熱處理廠, 台中職訓中心也買了一套, 從此把連老師帶入彩色金相的領域.在台灣 做彩色金相, 我算是Taiwan No. 1. S45C 調質後金相. I hope you like them. leomet 发表于 2012-12-4 21:33 static/image/common/back.gif
Showing off colorful micrographs of ductile iron induction quenched.
They were taken from transiti ...
Hello Master! Why the ferrite around the nodular graphite transforms to austenite earlier during induction heating ?does the graphite provide nucleation of austenite ? I think that area is in rich of Si. What is the Pearlite content of the raw cast iron ? leomet 发表于 2011-10-4 21:56 static/image/common/back.gif
1. 我並沒有要教任何人. 只是展示/分享漂亮的照片. 文章是自言自語, 練習寫作.英語能力夠的人可在此撿 ...
请教吴老，您都是在哪些英文网站上捡知识？ 本帖最后由 leomet 于 2013-4-13 11:23 编辑
leeyoung007 发表于 2013-4-11 17:03 static/image/common/back.gif
Hello Master! Why the ferrite around the nodular graphite transforms to austenite earlier during i ...
C% does the job by lowering the A3 temp. The Ferrite in direct contact with graphite nodule transforms to Austenite first.
Eng-tips;http://www.eng-tips.com/threadminder.cfm?pid=330
Cambridge university web site---to name a few. 很好，值得学习:)
努力中 leomet 发表于 2013-4-11 21:59 static/image/common/back.gif
C% does the job by reducing the A3 temp. The Ferrite in direct contact with graphite nodule tran ...
Thanks Metallurgical wizard!