Recent content by Quentin_alex

The first and second image are of 19 and 13 mm bars, respectively. The bars were not subject to a quenching process, but rather mostly air cooled. Taking the dimensions of the bar into account we might see a slightly finer structure in the center of the 13 mm bar. I think based on the images...

That was my first thought. The images show that the pearlite colonies are significantly larger in the first image, so I am lead to believe there is a difference in both cooling rate and carbon composition. Also, I must add that the micrographs were taken at the core of the bar.

Hello, I have two rebar samples of virtually identical chemical composition of 0.27 wt%C, 1.2 wt%Mn and 0.033 wt%V that are A706 grade. The rolling mill parameters are essentially the same yet I am seeing differences in pearlite size upon microscopy. The billets used to make the bars are...

Yes, I am seeing this in my testing. It is for a project. We mostly run thermomechanically treated bars (Tempcore process) that are A615 grade. They show the typical discontinuous yielding of plain carbon steel. The A706 grade is a low alloy steel predominately strengthened by the addition of...

What could prevent the discontinuous yield (upper and lower) points during a tensile test on a low alloy steel A706 grade? Thanks.

My question concerns the resultant particles of a co precipitation reaction. What effects occur when you accelerate/decelerate a co precipitation reaction? What are optimal conditions (speed, etc.) for this process? I am interested primarily in the effects on the resultant powder. Thank you.

Hello, I ran a test on an industrial composite of 30% glass-filled nylon 6, and my melting temperature peak is too low. The range was from -30 C to 275 C. Why could this be happening? Should I suspect the sample pan? Thanks.

For those who have worked in government, is the work experience viewed as attractive by companies in the private sector?

Thank you all for the responses. I am within a year of graduation from my program, so does the Navy or Air Force, for example, hire newly graduated candidates? Would this be a good first step to begin my career as a materials engineer?

What is it like to work as a materials engineer as a civilian with the Department of Defense?

Hello, I am currently a materials science major going into my junior year. I recently gained interest in medical school (specifically anesthesiology and radiology) However, I do not know if this is going to be the plan yet for me. I am thinking about changing my major to chemistry, so that I...

Hello, I am wondering if getting a mechanical or materials PhD will grant me more access to industrial automotive research opportunities. I understand the difference between materials and mechanical, but I am wondering if there's greater opportunity in materials research related to automotive...