\"This research addressed heat dissipation issues related to the adhesive wear observed in metal-to-metal wear systems, by developing a graphitic white iron to increase thermal diffusivity of the wear components. One of the premium materials commonly used in current metal-to-metal wear systems is Fe15Mo18Cr and field returned parts were characterized as part of this study. Failure analysis showed that white layers were formed on the wearing surface due to frictional heating and surface deformation. These white layers were extremely brittle and could be fractured easily during use, which in turn led to micro-galling defects that caused parts leakage. Increasing thermal diffusivity of the material was recommended to improve the performance of wear components.
A new alloy, graphitic white iron, was developed for metal-to-metal wear systems by introducing 3.2-9.6 vol.% graphite flakes into white irons, to increase thermal diffusivity and reduce friction and frictional heating. Graphite volume percent was quantitatively investigated. It turned out that, at 200 °C, thermal diffusivity increased by ~114% with increasing graphite to 7.6 vol.%. Abrasive and adhesive wear resistance was measured by dry sand/rubber wheel test and block on ring test, respectively. Empirical models were established to predict graphite volume percent for any given composition, and a Hashin-Shtrikman model was used to predict the thermal diffusivity of the multiphase alloy. Abrasive and adhesive wear resistance was found to depend upon composite hardness and graphite volume percent. It was found that 1 vol.% graphite was equivalent to an increase of 2.33 HRC and 2.66 HRC in composite hardness with respect to abrasive wear resistance and adhesive wear resistance, respectively”--Abstract, page iv.
","abstract_html":"<p>"This research addressed heat dissipation issues related to the adhesive wear observed in metal-to-metal wear systems, by developing a graphitic white iron to increase thermal diffusivity of the wear components. One of the premium materials commonly used in current metal-to-metal wear systems is Fe15Mo18Cr and field returned parts were characterized as part of this study. Failure analysis showed that white layers were formed on the wearing surface due to frictional heating and surface deformation. These white layers were extremely brittle and could be fractured easily during use, which in turn led to micro-galling defects that caused parts leakage. Increasing thermal diffusivity of the material was recommended to improve the performance of wear components.</p> <p>A new alloy, graphitic white iron, was developed for metal-to-metal wear systems by introducing 3.2-9.6 vol.% graphite flakes into white irons, to increase thermal diffusivity and reduce friction and frictional heating. Graphite volume percent was quantitatively investigated. It turned out that, at 200 °C, thermal diffusivity increased by ~114% with increasing graphite to 7.6 vol.%. Abrasive and adhesive wear resistance was measured by dry sand/rubber wheel test and block on ring test, respectively. Empirical models were established to predict graphite volume percent for any given composition, and a Hashin-Shtrikman model was used to predict the thermal diffusivity of the multiphase alloy. Abrasive and adhesive wear resistance was found to depend upon composite hardness and graphite volume percent. It was found that 1 vol.% graphite was equivalent to an increase of 2.33 HRC and 2.66 HRC in composite hardness with respect to abrasive wear resistance and adhesive wear resistance, respectively”--Abstract, page iv.</p>","abstract_has_math":false,"creators":["Wan, Jie"],"institution":"Missouri University of Science and Technology","degree_name":"Ph. D. in Materials Science and Engineering","degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T03:18:09Z","subjects":["Alloy design","Graphitic white iron","Metal-to-metal","Wear system","Materials Science and Engineering"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarsmine.mst.edu/doctoral_dissertations/3140","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Wan, Jie"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["Dissertation - Open Access"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph. D. in Materials Science and Engineering"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Missouri University of Science and Technology"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Alloy design","Graphitic white iron","Metal-to-metal","Wear system","Materials Science and Engineering"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarsmine.mst.edu/doctoral_dissertations/3140"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["\"This research addressed heat dissipation issues related to the adhesive wear observed in metal-to-metal wear systems, by developing a graphitic white iron to increase thermal diffusivity of the wear components. One of the premium materials commonly used in current metal-to-metal wear systems is Fe15Mo18Cr and field returned parts were characterized as part of this study. Failure analysis showed that white layers were formed on the wearing surface due to frictional heating and surface deformation. These white layers were extremely brittle and could be fractured easily during use, which in turn led to micro-galling defects that caused parts leakage. Increasing thermal diffusivity of the material was recommended to improve the performance of wear components.
A new alloy, graphitic white iron, was developed for metal-to-metal wear systems by introducing 3.2-9.6 vol.% graphite flakes into white irons, to increase thermal diffusivity and reduce friction and frictional heating. Graphite volume percent was quantitatively investigated. It turned out that, at 200 °C, thermal diffusivity increased by ~114% with increasing graphite to 7.6 vol.%. Abrasive and adhesive wear resistance was measured by dry sand/rubber wheel test and block on ring test, respectively. Empirical models were established to predict graphite volume percent for any given composition, and a Hashin-Shtrikman model was used to predict the thermal diffusivity of the multiphase alloy. Abrasive and adhesive wear resistance was found to depend upon composite hardness and graphite volume percent. It was found that 1 vol.% graphite was equivalent to an increase of 2.33 HRC and 2.66 HRC in composite hardness with respect to abrasive wear resistance and adhesive wear resistance, respectively”--Abstract, page iv.
"]},{"key":"dc:title","label":"Title","values":["On developing a graphitic white iron for metal-to-metal wear systems"]}]}],"canonical_facts":{"dc:creator":["Wan, Jie"],"dc:description.abstract":["\"This research addressed heat dissipation issues related to the adhesive wear observed in metal-to-metal wear systems, by developing a graphitic white iron to increase thermal diffusivity of the wear components. One of the premium materials commonly used in current metal-to-metal wear systems is Fe15Mo18Cr and field returned parts were characterized as part of this study. Failure analysis showed that white layers were formed on the wearing surface due to frictional heating and surface deformation. These white layers were extremely brittle and could be fractured easily during use, which in turn led to micro-galling defects that caused parts leakage. Increasing thermal diffusivity of the material was recommended to improve the performance of wear components.
A new alloy, graphitic white iron, was developed for metal-to-metal wear systems by introducing 3.2-9.6 vol.% graphite flakes into white irons, to increase thermal diffusivity and reduce friction and frictional heating. Graphite volume percent was quantitatively investigated. It turned out that, at 200 °C, thermal diffusivity increased by ~114% with increasing graphite to 7.6 vol.%. Abrasive and adhesive wear resistance was measured by dry sand/rubber wheel test and block on ring test, respectively. Empirical models were established to predict graphite volume percent for any given composition, and a Hashin-Shtrikman model was used to predict the thermal diffusivity of the multiphase alloy. Abrasive and adhesive wear resistance was found to depend upon composite hardness and graphite volume percent. It was found that 1 vol.% graphite was equivalent to an increase of 2.33 HRC and 2.66 HRC in composite hardness with respect to abrasive wear resistance and adhesive wear resistance, respectively”--Abstract, page iv.
"],"dc:identifier":["https://scholarsmine.mst.edu/doctoral_dissertations/3140"],"dc:subject":["Alloy design","Graphitic white iron","Metal-to-metal","Wear system","Materials Science and Engineering"],"dc:title":["On developing a graphitic white iron for metal-to-metal wear systems"],"dc:type":["Dissertation - Open Access"],"thesis:degree_name":["Ph. D. in Materials Science and Engineering"],"thesis:institution_name":["Missouri University of Science and Technology"]},"updated_at":"2026-07-24T03:18:09Z"}