基于V型缺口试样冲击性能确定1 Cr17 Ni2不锈钢的热处理工艺

摘要

1Cr17Ni2 stainless steel was quenched and tempered at different temperatures,and then the relationships between the impact property of the V-notch specimen and the quenching and tempering temperatures were investigated.The optimum heat treatment process was determined based on the impact properties of the V-notch specimen and the tensile properties of the tested steel after heat treatment with the optimum process were measured.The results show that the impact absorption energies of V-notch specimens increased with the increasing quenching and tempering temperatures.The effect of tempering temperature on the fracture mode was greater than that of the quenching temperature.With the increase of tempering temperature,the fracture mode changed from brittle fracture by intergranular and cleavage to toughness fracture by dimple.The 1Cr17Ni2 stainless steel can meet the requirements of the impact toughness and strength of stud at the quenching temperature of 980 ℃ or 1 020 ℃and the tempering temperature higher than 650 ℃.If a twice tempering was necessary,then the twice tempering temperature higher than 650 ℃ was recommended.%对1Cr17Ni2不锈钢进行了不同温度的淬火＋回火热处理,研究了其 V 型缺口试样冲击性能与淬火和回火温度的关系；基于 V 型缺口试样冲击性能确定了较佳热处理工艺,并测试了该工艺热处理后试验钢的拉伸性能.结果表明：V型缺口试样的冲击吸收功随淬火温度和回火温度的升高而增大；回火温度对其断裂方式的影响大于淬火温度的,随回火温度升高,断裂方式从沿晶和解理的脆性开裂向韧窝型韧性开裂转变；当淬火温度为980℃或1020℃,回火温度大于650℃时,该钢可满足螺柱冲击韧性和强度的要求,如需二次回火,则推荐二次回火温度应高于620℃.