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借助OM、SEM及X-ray萃取相分析技术,研究了奥氏体化温度对一种新型二次硬化渗碳钢C61的组织与力学性能的影响。结果表明:当奥氏体化温度较低时,钢中存在M_6C、M_(23)C_6、Nb(C,N)未溶相,随着奥氏体化温度的升高,碳化物逐渐溶解,在950℃时,钢中仅有少量Nb(C,N)残留;当奥氏体化温度大于1000℃时,C61钢奥氏体晶粒明显粗化,抗拉强度、屈服强度、冲击韧性大幅降低,晶粒粗化温度为1000℃;C61钢最佳奥氏体化温度为950℃,此时钢的抗拉强度为1625 MPa,屈服强度为1556 MPa,冲击吸收能量为82 J。
The effect of austenitizing temperature on the microstructure and mechanical properties of a new type of secondary hardened carburized steel C61 was studied by means of OM, SEM and X-ray extraction phase analysis. The results show that when the austenitizing temperature is low, there are M_6C, M_ (23) C_6 and Nb (C, N) undissolved phases in the steel. With the increase of the austenitizing temperature, the carbides gradually dissolve, At 950 ℃, only a small amount of Nb (C, N) remains in the steel. When the austenitizing temperature is higher than 1000 ℃, austenite grain coarsens obviously in C61 steel. The tensile strength, yield strength and impact toughness are large The grain coarsening temperature is 1000 ℃; the optimal austenitizing temperature of C61 steel is 950 ℃, the tensile strength of steel is 1625 MPa, the yield strength is 1556 MPa and the impact absorption energy is 82 J.