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Hi, I am working as a heat treatment engineer in one of the fastener company. 2 days ago, i saw something interesting. color of the waspaloy parts after heat treatment differed from each other( from purple to black) . Firstly i went to laboratory to check their mechanical and metallurgical...

Hello guys i am working at one of the fastener company in Turkey. I am the responsible of coating department(Dry-film painting department). The problem is that we dont have any non-destructive coating thickness device. So we use cross-sectioning the parts in the laboratory. But, this takes...

Hello, We have a bath to anodize the titanium that called anodizing bath. It contains sulphuric acid + de-ionized water. And there is a coming acrcreditation about chemical coating. When i check the checklist of accreditation, there is a question about titanium amount of sulphuric acid bath. ıt...

Thanks for all answers guys. Answers helped me a lot.

Hello guys, I have been working as heat treatment engineer since september 2017. This is my first experience in industry. I have problem with the hardness and tensile of some parts. The problem is, actually we are using different type of raw materials(15 different types for aısı4340 for...

Is there any crucial effect of heating rate in solution or aging process for precipitation hardenable alloys ?

Actually i dont know because i always do heat treatment process to machined parts. But i think it is because of hardness and complexity of the parts.

I did the process at 930 C for 2 hours. Then i cooled it with water (10 C water). Results were awesome. Hardness values are between 42.5-43.0 .

I've checked ASTM E140 and spec. allows me to convert from 1kgf,5kgf,10kgf,30 kgf vickers to rockwell c for nickel alloys.So, i am going to develop my own correlation table from heat treated raw material block. Thanks for your help guys.

Is is possible to convert from microvickers ( 300 gf ) to Rockwell C scale for nickel-base alloys ?

Thanks for your help guys. Both of you were really helpful. I am going to contact with them. I will let you know in this post if i can find a solution.

I had two experiement, first one is oil quenching after solution and the other one is air cooling after solution. I checked the grain size for all the parts. I fıgured out an interesting thing, bigger the grain size higher the hardness. The minimum hardness value that i measured from the parts...

metengr; Yes ı have access to metallurgical lab. I checked the microstructere and grain size. It wasnt homogenous and grains were really small.(something between ASTM 8-9) EdStainless; Actually i always find the hardness between 45-46 HRc. I didnt understand your questıon because i dont know...

Hello I have some thinwall parts made of inco718. Part diameter is about 6 mm and wall thickness is about 1 mm. The problem is hardness value after heat treatment process. Heat treatment process that i did is conventional inco 718 heat treatment (solution heat treatment between 930-1010 C - min...