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Dear Sirs, I have got the result from EDS-SEM comparing with Emission Spectrometer of S45C and A2618 samples. Result was so different. Spectrometer result was OK. I know that EDS-SEM is only qualitative analysis but when refer from detection range of EDS-SEM it should be no problem. Could...

Dear all, After quenching and tempering. I did the tempering at 500℃x24hr for grain boundary embrittlement.Then etched by this solution 1. Saturated picric solution 50 ml (4g picric acid mix with water) 2. Surface-active-agent, Sodium dodecylbenzensulfonate 5ml 3. HCL 1.0ml As a result, I...

For wetting agent, I used detergent for this purpose. Thank you

I found excessive of black smut and some pitting when observed with microscope after etching by Bechet and Beaujard solution at room temperature for 1 hr. My purpose is for observing prior-austenite grain size in quenched&tempered SUP9 spring steel. Please suggest me how to fix this problem...

Dear all concerns, I have some questions about cold extrusion process for medium carbon steel. My material is round bar. Diameter is around 35 – 50 mm. Total reduction area around 35 – 45%. 1. What are differences in technical detail if we compare only single and multi step while other...

I would like to know about method or process that can control or thicken passive film in stainless steel. When i search it from Google, there are informations talked about anodizing or electro polishing but these method used for non ferrous metal like aluminium,titanium etc. not stainless steel...

I have some question about self-sharpening effect on slitting blade material that used in pineapple canned industry. Does anybody know about this kind of material used? What is the effect that makes blade material can self-sharpen or retain their sharpness during cut pineapple? In my...

Thank you for all valuable posts. I will take this sample for deep metallographic examination as your suggestions

Dear alls, Thank you for all good suggestions. Please consider additional information as following items. 1.Side view photo 2. Yes, this failure occurred through the center of the weld 3. What is the darker central one? It was hole in seamless tube 4. Is it part of the welded joint? Yes, this...

This failure occurred at friction welding area on induction hardened hollow shaft after rotation bending fatigue test about 10,000 cycles. So, please specify the failure mode and crack initiation site for this case. Thank you for every suggestions.

I would like to know about the objective and detail of cold clipping process in titanium blade forging Thank you for your kind supports,

TVP We did not examine on cutting surface but we will test on neighbor surface area that heat due to cutting might be affected to it. So, i am not sure that this quantity of heat will affect to measurement result or not Thank you for your suggestion Bodyslam

Dear sirs, Please suggest me about standard or equipment that appropriate for coil spring 's roughness measurement. Thank you for all kind support

Dear sirs, Please advise me about the standard or suitable practice for residual stress specimen preparation for XRD technic. I don't sure that normal abrasive cut-off wheel with cooling affected to this kind of measurment or not. We anxious about quantity of heat genearated near the...

I would like to know the method and/or standard which can determine %Martensite and its grain size in heat treated steel In my opinion, martensite gran size cannot be measured due to its needle shape. Thank you for your suggestions

Now, I am studying to find optimum parameters of heat treatment process for each part of coil spring but I don't have its CCT diagram. Could you advise me to find this information? Best regards, Marut B.

I would like to know what technique can measure residual stress distribution in coil spring after shot peening. Currently, I had consulted with XRD’s lab and they can measure only stress on outer surface not distribution stress. In addition, on nowadays technology, which machine or technique...