预处理温度对00Cr12Ni10MoTi马氏体不锈钢强度的影响

Effect of Pre-Treatment Temperature on the Strength of 00Cr12Ni10MoTi Maraging Stainless Steel

研究了预处理温度对00Cr12Ni10MoTi马氏体不锈钢强度的影响。研究结果表明:在较低预处理温度下,通过非扩散α′→γ逆转变形成的奥氏体遗传了原始的锻态组织。而在950℃以上温度预处理则形成再结晶的奥氏体。由于最终750℃固溶处理遗传了预处理组织,因此预处理对钢的强度有明显的影响。材料在低于850℃预处理时最终组织中残余奥氏体量较高,不利于提高强度。850℃预处理出现峰值强度,继续提高预处理温度,强度又下降。由于950℃以上预处理形成再结晶的奥氏体,使得最终热处理后的强度稳定在较低的水平。

The effect of pre-treatment temperature on the strength of 00Cr12Ni10MoTi maraging stainless steel was investigated.The results show that the austenite which is formed by non-diffusion reverse α′→γ transformation inherit the forging structure at lower pre-treatment temperature,recrystallized austenite is obtained after pre-treatment above 950℃.As the 750℃ final solution treatment inherits the structure of the steel as pre-treatment,the pre-treatment has significantly effect on the steel strength.The content of residual austenite of the final structure is higher when the material was pre-treated below 850℃,and it reaches the maximum strength at 850℃;the strength is decreased with the pretreatment temperature increasing,because recrystallized austenite is formed above 950℃,the strength keeps at a low level after the final heat treatment.