Detection method for carbonitrided high-carbon chromium long-life bearing part

• Main Authors: WANG ZHIQIANG, SHAO QINGSHAN, REN QIANGLIN, ZHENG JIANMING, TANG ZHIBIAO, ZHANG KEYAN
• Format: Patent
• Language: English
• Published: 11.11.2015
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a detection method for a carbonitrided high-carbon chromium long-life bearing part. The detection method comprises the following steps: detecting an effective case depth, namely tempering the bearing part at a high temperature, and then detecting a distance between the surface of the part and a core position of which the Vickers hardness is 500HV, wherein the distance is 0.3 to 0.5mm; detecting the C/N concentration of a penetration layer at a position which is 0.15mm away from the surface of the part in the deep direction, wherein the concentration of C is 1.2 to 1.6 percent, the concentration of N is greater than or equal to 0.1 percent, and the concentration of C+N is 1.5 to 2.0 percent; detecting the hardness at positions which are 0.1mm and 2mm away from the surface of the part in the deep direction respectively, wherein the hardness of 60 to 67HRC and the hardness of 58 to 63HRC are obtained; detecting the content of retained austenite at positions which are 0.05mm and 2mm away from the surface of the part in the deep direction respectively, wherein the content of 17 to 40 percent and the content of 5 to 12 percent are obtained; detecting a metallographic structure of the penetration layer, wherein a hidden needle or a fine needle contains nitrogen martensite, carbonitrides are granular and are not in a blocky shape, an angular shape and a net shape, and the grain size of the carbonitrides is not greater than 8 microns. The method is reliable, and the consumed time is short.