work layer meaning in English

作业层

Large area of spalling accured on the work layer of high - crcentrifugal cast iron roll after heat treatment
高铬离心复合铸铁轧辊辊身工作层在热处理后发生大面积剥落。
The results indicated that discontinuity of micro structure of work layer caused by in . homogeneous distribution of chemical composition , different pattern of carbide , mhomogeneity of hardness lead to large area of spalling and frther scrapping of roll
结果表明，化学成分的不均匀分布，造成轧辊辊身工作层组织不连续、碳化拘形态各异使辊身工作层硬度不均匀，产生大面积剥落，最终导致轧辊报废。
In this paper , the vsi is produced by powder metallurgy . various alloy elements added , porosity and microstructure of materials is considered to affact the vsi ' s property ; matching between the working and none - working layer of vsi is discussed ; and the cost reduction of two - layer vsi is analysed as well
研究了各种合金元素的添加、孔隙率和显微组织对阀座圈工作性能的影响；讨论了双层阀座圈工作层与非工作层之间的匹配；分析了双层阀座圈在成本上的优势。