1Cr21Ni5Ti钢管冷弯脆性问题研究

论文研究了热处理工艺对1Cr21Ni5Ti钢组织与性能’的影响，找到了材料冷弯脆性的原因，得到了如下结论：（1）材料产生脆性的原因是敏化处理时。相的析出，材料固溶后在650℃。900℃敏化处理时析出。相，导致塑性和韧性降低，并且在700℃敏化口相的析出量最大；（2）材料经固溶处理后在700℃保温10分钟时就有口相析出，20分钟达到最大析出量，导致塑性和韧性降低；（3）σ相在900℃～950℃之间开始溶解。已经产生。相的材料可以通过重新加热到950℃以上然后快速冷却来消除因σ相的析出而产生的脆性。

Research on Cold-bending Brittleness of 1Cr21Ni5Ti Steel Tube

Based on research on the effect of heat treatment process on the structure and property of 1Cr21Ni5Ti,the reasons for cold-bending brittleness of the material was found.The results are listed below:(1)the brittleness was caused by precipitation of σphases during sensitizing treatment,which resulted in decrease in the plasticity and toughness.The maximum precipitated amount of σphase appeared at senxitizing temperature of 700℃;(2) σphases precipitated when the material was hold 10 minutes at 700℃after solution treatment and large amount of σphases precipitated after hold time of 20 minutes,which resulted in decrease in the plasticity and toughness;(3) σphases began to desolve in the temperature range of 900 and 950℃.The brittleness of the material due to precipitated σphases could be eliminated by reheating of the material to over 950℃.