Microstructures and Mechanical Properties of Austempering Cr-Mo (SCM 435) Alloy Steel

作者：Chen Cheng Yi; Hung Fei Yi^*; Lui Truan Sheng; Chen Li Hui

来源：Materials Transactions, 2013, 54(1): 56-60.

DOI：10.2320/matertrans.M2012317

• SCM435
• alloy steel
• austempering
• mechanical properties

SCM435 is a Cr-Mo alloy steel and it is usually used to make the matrix of tempered-martensite by oil bath method, but it has some problems about reliability in the thin plate specimens. This research used the austempering heat treatment on the SCM435 thin plate specimen with a type of double loop and obtained the Cr-Mo bainite structure, and then we could further investigate the mechanical properties of SCM435 bainite materials. Experimental data showed that the stability of the mechanical properties of the specimen with austempering temperature 830 degrees C for 25 min was better than that of 15 min. The size of the austenite grains affected the strength of thin plate bainite specimen. After austempering at 830 degrees C for 25 min and salt bath at 290 degrees C, the stability of the ultimate tensile strength (UTS) was better than that of the salt bath specimens at 310 and 330 degrees C. The average hardness of all the specimens was more than HRA70. The specimen with austempering at 830 degrees C for 25 min and salt bath at 290 degrees C for 30 min had bigger grain size of the austenite and retained gamma phase of 11.4 vol%. It also had higher hardness and strength. So, the austempering SCM435 alloy was improved for tensile strength comparing with traditional oil tempered-martensite process.

• 出版日期2013