高温后Q235钢材力学性能试验研究

通过对高温后Q235钢材力学性能的试验研究,描述了高温后钢材的表面特征,探讨了钢材受热温度和恒温时间对高温后钢材力学性能的影响,并建立了高温后钢材屈服强度-受热温度、极限强度-受热温度、泊松比-应力比和拉伸应力-应变关系曲线拟合方程.试验表明:随着受热温度的升高,高温后钢材的屈服强度、极限强度整体上呈降低趋势,而弹性模量和泊松比则基本不变;恒温时间对力学性能的影响不太明显;所拟合的高温后钢材屈服强度—受热温度、极限强度—受热温度、泊松比—应力比和拉伸应力—应变关系曲线方程均与实测结果吻合较好.

Experimental Research on Mechanical Properties of Q235 Steel after High Temperature Treatment

In experimental investigation on mechanical properties of Q235 steel after high temperature treatment,surface characteristic and influences of the important parameters including heating temperature and temperature exposure time on the mechanical properties of steel after high temperature treatment were studied.Formulas for Possion's ratio-stress ratio,tensile stressstrain,yield strength-heating temperature,tensile strength-heating temperature of steel after high temperature treatment are proposed.The result show that: with the heating temperature rising,yield strength and tensile strength tend to decrease as a whole,while elastic modulus of the steel and Possion's ratio almost remain unchanged;with increasing temperature exposure time,the mechanical properties of the steel after high temperature treatment are hardly influenced; the calculated results by above-mentioned formulas agree well with test ones.