欢迎吴老师和大家指点

xianshanlushui

Here is the sturcture of H13, the tool is about 200kg weight,and it's shape like an open thin box,

to control the deformation of the tool, we used free cooling in the vacum furnace (no pressure) about 7 min in quenching,

and the temperature from 1030 down to 1000, then cooling fast.

and then we get the sturcture below.

my supervisor think the cooling rate is very low at the quenching begining, so it formed much Grain Boundary Carbieds,

but i think it,s not formed in the heat-treatment process, it's the materials fault, am i right?

xianshanlushui

补充张500X组织

bbb53

Chinese English

leomet

Below is the microsturcture of H13, the tooling is about 200kg in weight, and it shapes like an open thin box.

To control the deformation of the tooling, we used free cooling in the vacum furnace (no pressure) for about 7 min on quenching,

and the temperature from 1030 down to 1000, then cooling fast.

and then we get the sturcture below.

my supervisor think the cooling rate is too low at the  begining of quenching, so it formed much Grain Boundary Carbieds,

but i think it's not formed in the heat-treatment process, it's the materials fault, am i right?



1. Chinese English is O,K. as long as your idea is understood. Everybody starts from somewhere.

2. It's a bit of over-etched for the 500X photo. Try a lighter eteching. Also, try different  etchants,   say. FeCl3, or else.

3. I see  few NEW (not so sure about this ) and many OLD (worm-like, inside grains) GBK films. You can see more samples of old and new gbk on my posts in my blog in Taiwan yahoo, searching with LeoMet.

[ 本帖最后由 leomet 于 2009-5-6 07:06 编辑 ]

zhuzhiyang

好深奥啊，有没有中文的？