热处理对AISI4340钢风机主轴性能的影响
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摘要
对AISI 4340钢风机主轴进行了热处理工艺试验,测定了热处理后主轴的力学性能。结果表明,锻造后经860℃正火和640℃回火,850℃淬火和540℃回火处理后,主轴的力学性能为:抗拉强度1250 MPa,屈服强度1 140 MPa,断后伸长率14.5%,断面收缩率55%,-40℃冲击吸收能量38.5~41.3 J,表面硬度40~42 HRC,符合技术要求。此外,采用专用夹具、垂直装炉和预冷淬火,有效减小了主轴的热处理畸变。
One type of main shaft of wind-driven generator,made from AISI 4340 steel,subjected to trial heat treatment,and then to mechanical property measurements. The results indicates that after forging,normalizing at860 ℃ and tempering at 640 ℃,followed by quenching from 850 ℃ and tempering at 540 ℃ the main shaft offers such mechanical properties as tensile strength of 1 250 MPa,yield strength of 1 140 MPa,elongation of 14. 5%,reduction of area of 55%,impact absorption energy at- 40 ℃ of 38. 5 to 41. 3 J and surface hardness of 40 to42 HRC,conforming with the requirements. Also,heat treatment distortion was significantly decreased by the use of specially made fixture,vertical furnace loading and delay quenching.
One type of main shaft of wind-driven generator,made from AISI 4340 steel,subjected to trial heat treatment,and then to mechanical property measurements. The results indicates that after forging,normalizing at860 ℃ and tempering at 640 ℃,followed by quenching from 850 ℃ and tempering at 540 ℃ the main shaft offers such mechanical properties as tensile strength of 1 250 MPa,yield strength of 1 140 MPa,elongation of 14. 5%,reduction of area of 55%,impact absorption energy at- 40 ℃ of 38. 5 to 41. 3 J and surface hardness of 40 to42 HRC,conforming with the requirements. Also,heat treatment distortion was significantly decreased by the use of specially made fixture,vertical furnace loading and delay quenching.
引文