Wind power bearing ring 42 crmo steel tempering process test

42 crmo steel 2019 - wind power bearing ring conditioning process test 02 - 01 Wang Yunguang, xiao-dong sun, sun, Government of luoyang bearing co. , LTD. , state key laboratory of aerospace precision bearing) 42 crmo steel bearing ring conditioning often used oil quenching cooling medium, as a result of the limitation of oil cooling performance of the bearing ring after quenched and tempered low impact energy. Special service conditions of 42 crmo steel wind power bearing ring, strict in impact energy. In order to achieve 42 crmo steel wind power bearing ring's technical requirements, it is necessary for 42 crmo steel wind piece. modified technique of bearing ring experiment. 1. Process test ( 1) Test ring choose 42 crmo steel wind power bearing ring ring as a test. Test ring size: & Phi; 700毫米× Φ 450毫米× 180毫米( Outer diameter & times; Inside diameter & times; High) , its chemical components are shown in table 1, the chemical composition in accordance with GB/T30771999. The chemical composition of table 1 test ring ( The mass fraction) （ %） （ 2) Test process with oil and water quenching medium of 42 crmo steel wind power bearing ring conditioning experiment was carried out. Oil cooling of quenching medium performance curve as shown in figure 1, water cooling of quenching medium performance curve as shown in figure 2; Oil quenching and tempering process curve as shown in figure 3, water-based quenching and tempering process curve as shown in figure 4. Figure 1 oil cooling performance graph 2 water cooling performance graph 3 oil quenching and tempering process graph 4 water-based quenching and tempering process curve ( 3) Mechanical properties test ring after quenched and tempered piece. modified technique according to the figures 3 and 4, respectively for 42 crmo steel conditioning wind power bearing ring, and sample processing and mechanical properties test, test results are shown in table 2. Table 2 mechanics performance test results can be seen from table 2, oil quenching and tempering after 42 crmo steel mechanics performance of wind power bearing ring can not meet the technical requirements; The mechanical properties of water-based quenching and tempering after bearing ring can satisfy the requirement of 42 crmo steel wind power bearing ring. 2. Results can be seen from the figure 1 and figure 2, because the oil quenching medium high temperature and cooling rate is too small, resulting in bearing ring hardening layer shallow and less number of martensite after quenching; And water-based quenching medium high temperature and cooling speed is faster than oil, using water-based quenching bearing ring after hardening layer depth and martensite after quenching. Martensite after quenching quantity directly decide how much to after high temperature tempering sorbite, sorbite what determines the final mechanical properties of bearing ring. Low temperature stage cooling performance of water-based quenching medium and oil quenching medium, so the water quenching and tempering after conditioning technique of bearing ring also won't produce crack. 3. Epilogue ( 1) 42 crmo steel after quenching and tempering water wind power bearing ring mechanical properties can meet the requirements of 42 crmo steel wind power bearing ring. （ 2) 42 crmo steel after quenching and tempering water wind power bearing ring can ensure that do not produce quenching cracks. Source: the metal processing ( Hot working) 11, 2017