Effect of copper on microstructure and strength and ductility of low alloy wear resistance steel

ZHENG Ai- qin,SONG Xin- li,MA Yu- xi,SUN Xin- jun,JIA Juan,LIANG Xiao- kai

Journal of Iron and Steel Research ›› 2018, Vol. 30 ›› Issue (9) : 747-753.

Journal of Iron and Steel Research ›› 2018, Vol. 30 ›› Issue (9) : 747-753. DOI: 10. 13228/j.boyuan.issn1001- 0963. 20170443

Effect of copper on microstructure and strength and ductility of low alloy wear resistance steel

  • ZHENG Ai- qin1,SONG Xin- li1,MA Yu- xi1,SUN Xin- jun2,JIA Juan1,LIANG Xiao- kai2
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Abstract

The effect of copper on the microstructure and strength and ductility of low alloy wear resistance steels without copper and copper bearing was studied. The CCT curve was calculated by JmatPro software. The microstructure was analyzed by OM and TEM and the mechanical properties and ductility were tested by universal tensile testing machine and impact testing machine. The results show that the element of copper increases the stability of austenite and the transformation of ferrite and pearlite is postponed for the copper bearing steel. The microstructure is composed of matensite and lower bainite for the experimental steels and the content of martensite of the steel bearing copper is higher than the steel without copper. There are nano- size precipitations of (Nb,Ti)C and (Nb,Ti,Mo)C in the matrix of the two steels. The yield strength and the impact energy at -60℃ of the steel with 0. 49 mass% copper is higher than that of the steel without copper. The element of copper is benefit to improve strength and low temperature ductility for the low alloy resistant steel.

Key words

Copper / Low alloy wear resistance steel / Microstructure / Strength and ductile

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ZHENG Ai- qin,SONG Xin- li,MA Yu- xi,SUN Xin- jun,JIA Juan,LIANG Xiao- kai. Effect of copper on microstructure and strength and ductility of low alloy wear resistance steel[J]. Journal of Iron and Steel Research, 2018, 30(9): 747-753 https://doi.org/10. 13228/j.boyuan.issn1001- 0963. 20170443

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