کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5018004 1466719 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study on the effects of forming conditions on microstructural evolution and forming behaviors of Cr-V-Mo tool steel during multi-stage thixoforging by physical simulation
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
Study on the effects of forming conditions on microstructural evolution and forming behaviors of Cr-V-Mo tool steel during multi-stage thixoforging by physical simulation
چکیده انگلیسی
The inhomogeneous quality of products manufactured by semisolid forming is mainly attributed from the phase segregation of semisolid metal slurry during forming. Phase segregation can be inhibited by lower forming temperature, higher strain rate, and lower stroke. However, the realization of net-shape forming with above parameters is quite difficult. In this study, a multi-stage thixoforging strategy including a partial melting, a fast first compression, a partial solidification, and a secondary compression was proposed to weaken phase segregation of thixoformed samples. A physical simulation of multi-stage thixoforging was conducted on commercial rolled Cr-V-Mo tool steel SKD11, using a multistage hot compression test machine. The microstructural evolution and forming behaviors of the SKD11 steel slurries in different stages of multi-stage thixoforging with various forming parameters were investigated experimentally. Out flow of liquid phase does not occur throughout the thixoforming, and can be inhibited effectively by partial solidification and subsequent secondary compression. SKD11 steel sample more homogenous microstructure and smoother surface was manufactured by multi-stage thixoforging including a fast first compression with a stroke of 4 mm and a strain rate of 2.0/s at 1280 °C, a partial solidification to 1240 °C with a cooling rate of 2 °C/s, and a secondary compression with a stroke of 2 mm and a strain rate of 0.1/s at 1240 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Processing Technology - Volume 248, October 2017, Pages 275-285
نویسندگان
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