摘要
采用稀土低温高浓度渗碳工艺实现了２０Ｃｒ２Ｎｉ４Ａ钢渗碳后直接淬火，与传统热处理工艺相比较，处理后齿轮的弯曲疲劳试验结果表明，新工艺较传统工艺在弯曲疲劳强度方面有较大幅度的提高：５０％可靠度的对数值疲劳寿命，在６９３ＭＰａ试验应力级下提高了２．４５倍；在５６４ＭＰａ应力级提高了１２倍。对给定寿命Ｎ＝３×１０￣（６）、及５０％可靠度的中值疲劳极限提高了６４．５％。效果十分显著。
The steel 20Cr2Ni4A can be directly quenched by using the high carbon concentration carburizing process at low temperature with rare earth element. The experimental results show that compared with the conventional process,the bending fatigue strength of gears treated with new process mentioned above inereases2.45times when the stress is 693MPa and 1 2 times when the stress equal to 564MPa. When using the logarithmic average value of fatigue endurance under 50% degree of raliability,the middle value fatigue limit increases by 64.5% under the given life(N=3×106)and 50% degree of reliability. The effect of the new process is very remarkable.
出处
《材料科学与工艺》
CAS
CSCD
北大核心
1994年第3期61-67,共7页
Materials Science and Technology
关键词
疲劳强度
高浓度渗碳
稀土渗碳
rare earth caburizing
high concentration carburizing
high carbon potential carburizing
