Study researches durable factors of the grain size in 18CrNiMo7-6 by heating and cooling method. Results show that alloying elements Nb and Al have a strong pining effect on the grain boundaries, Al/N ratio between 2.0-2.5 can promote the grain not to grow up for a long time, and refine grains significantly with furnace heating and after carburizing-quenching once, and can inhibit the abnormal growth of individual grains.
FPGA structures are common designed in Serial structure and Parallel structure. As the most efficient one, Parallel structure also could be divided into whole-parallel and half-parallel which we called pipe-line structure. Whole Parallel structure FPGA take a great advantage on speed but consuming enormous resources. Moreover, FFT cannot give enough details on Time-frequency domain. In order to avoid these disadvantages, proposed STFT processer plan on FPGA. Based on the research on algorithms STFT, we gave an improved pipeline structure FPGA design. Then this design implied high speed STFT which take both speed and precision into count on FPGA. At the last of this paper, we conducted signal test. In this step , any signals were all collected from actual work condition. And then verify the feasibility of the program through simulation and actual signal test.
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