کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1571105 1514399 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanical properties and corrosion resistance of steel X210CrW12 after semi-solid processing and heat treatment
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Mechanical properties and corrosion resistance of steel X210CrW12 after semi-solid processing and heat treatment
چکیده انگلیسی
Semi-Solid Metal Processing (SSM) is one of the modern methods of steel forming. SSM of hot rolled X210CrW12 tool steel was conducted at 1250 °C, in order to obtain about 30% of liquid phase. The microstructure consisted of globular austenitic grains surrounded by eutectic mixture (ferrite, austenite and M7C3 carbides). The average hardness of as-SSM samples was 470 HV5, while the coefficient of abrasion resistance reached 7.9 * 10− 6 mm3/Nm. The compression strength of thixo-casts of X210CrW12 steel reached 4850 MPa at the plastic strain of 34%, although the yield stress was only 810 MPa. The X210CrW12 alloy just after thixo-casting revealed disadvantageously small wear resistance due to a large amount of metastable austenitic structure. A heat treatment consisting of 2 h tempering at 555 °C and additional low temperature tempering at 250 °C led to the hardness increase up to 650 HV5 as well as to the improvement of abrasion resistance to 1.8 * 10− 6 mm3/Nm. The compression strength and plastic strain decreased to 3140 MPa and 8.9%, respectively, while the yield stress increased up to 2050 MPa. Such very good mechanical properties were due to a complex microstructure consisting of globular grains containing the tempered martensite, fine perlite and M7C3 carbides surrounded by eutectic mixture. Tempering at 630 °C for 2 h led to the transformation of primary austenitic grains into perlite and carbides. It caused a decrease in hardness down to 495 HV5 and the compression strength to 2300 MPa, and the deterioration of abrasion resistance to 7.4 * 10− 6 mm3/Nm. The corrosion measurements revealed that the X210CrW12 steel directly after SSM was susceptible to the pitting corrosion in 0.1 M sodium chloride solution. The corrosion resistance of thixo-casts after tempering at 555 °C/2 h slightly decreased compared with the as-thixoformed samples.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 88, February 2014, Pages 100-110
نویسندگان
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